Change in performance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value January 5, 2016 BilateralJan2016 [Member] BilateralJan2016 [Member] Economic hedges Economic Hedging Instrument Liabilites [Member] Economic Hedging Instrument Liabilites [Member] Number of credit agreements Number of Credit Agreements Number of Credit Agreements Accrued expenses Accrued Liabilities, Current Other Noncurrent Liabilities Other Noncurrent Liabilities [Member] Credit facility Aggregate Bank
Commitment Line of Credit Facility, Maximum Borrowing Capacity Changes in assets and liabilities: Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Regulatory Matters Public Utilities Disclosure [Text Block] Actuarial losses and prior service costs Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) and Prior Service Cost (Credit) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) and Prior Service Cost (Credit) Award Type [Domain] Award Type [Domain] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Remaining performance obligations, timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Investment, Name [Domain] Investment, Name [Domain] Repayments of short-term debt Repayments of Short-Term Debt Income Taxes [Line Items] Income Taxes [Line Items] Allowance for Credit Losses on Accounts Receivables Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Line of credit facility, interest rate at period end Line of Credit Facility, Interest Rate at Period End Noncontrolling interests Members' Equity Attributable to Noncontrolling Interest Cash collateral Cash Collateral for Borrowed Securities Byron Dresden Byron Dresden [Member] Byron Dresden Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Acquisitions of assets and businesses Payments to Acquire Businesses, Gross Significant Accounting Policies Additional Narrative Information [Line Items] Significant Accounting Policies Additional Narrative Information [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Option premiums received (paid), net Increase (Decrease) In Option Premiums Collected Received The net change during the reporting period in option premiums collected and paid. Options reflect the right or obligation to buy or sell an energy-related commodity and are classified in current and long-term mark-to-market derivative assets and liabilities. Spent Nuclear Fuel Obligation Spent Nuclear Fuel Obligation [Table Text Block] Spent Nuclear Fuel Obligation [Table Text Block] Derecognized receivables transferred at fair value Transfer of Financial Assets Accounted for as Sales, Amount Derecognized Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Mark-to-market derivative assets Mark-to-market derivative assets Mark-to-market derivative assets (current) Derivative Asset, Current 2028 Lessee, Operating Lease, Liability, to be Paid, Year Five Jointly Owned Utility Plant Interests [Table] Jointly Owned Utility Plant Interests [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Letters of credit held Letters Of Credit Held Letters of credit held related to credit risk Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Daily Simple SOFR Rate Daily Simple SOFR Rate [Member] Daily Simple SOFR Rate Ownership [Axis] Ownership [Axis] CENG CENG [Member] Represents a joint venture relating to a nuclear generation and operation business. Operating lease income Operating Lease, Lease Income, Lease Payments Number of sites Operations, Sites Across the Country Operations, Sites Across the Country Total liabilities Financial Liabilities Fair Value Disclosure Current liabilities Liabilities, Current [Abstract] Deferred Deferred Federal Income Tax Expense (Benefit) Total liabilities Liabilities in an Asset Position, Fair Value Disclosure Liabilities in an Asset Position, Fair Value Disclosure Regulatory offset to NDT fund-related activities Regulatory Offset Nuclear Decommissioning Trust Fund Activity This item represents the contractual elimination of nuclear decommissioning trust fund-related activity, which may include realized income (losses), unrealized income (losses), asset retirement obligation accretion, asset retirement cost amortization, investment income and related income taxes. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Separation-related adjustment Other Comprehensive Income (Loss), Defined Benefit Plan, Transfer to Parent Company Due to Split Other Comprehensive Income (Loss), Defined Benefit Plan, Transfer to Parent Company Due to Split Intersegment Revenues Intersegment Eliminations [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Cash proceeds received Proceeds from Divestiture of Businesses Zion Station Zion Station [Member] Zion Station Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Schedule of line of credit, short term, and long term debt [Table] Schedule of line of credit, short term, and long term debt [Table] Schedule of line of credit, short term, and long term debt Pre-tax impairment charge Impairment, Long-Lived Asset, Held-for-Use Diluted (in dollars per share) Earnings Per Share, Diluted Unrealized gain Unrealized Gain (Loss) on Investments Customer accounts receivable (net of allowance for credit losses of $56 and $46 as of December 31, 2023 and 2022, respectively) Customer accounts receivable (net of allowance for credit losses of $56 and $46 as of December 31, 2023 and 2022, respectively) Customer Accounts Receivable, after Allowance for Credit Loss, Current December 8, 2023 BilateralDec2023 [Member] BilateralDec2023 Total RNF for Reportable Segments Revenue Net Of Purchase Power And Fuel From External Customers Amount of revenues net of purchased power and fuel expense from external customers. Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Recourse Status [Axis] Recourse Status [Axis] Proceeds from short-term borrowings with maturities greater than 90 days Proceeds from short-term borrowings with maturities greater than 90 days Proceeds from Short-Term Debt, Maturing in More than Three Months Property Real Estate Tax Expense Rabbi trust investments subtotal Rabbi Trust Investments [Member] This element represents the assets measured at fair value on a recurring basis related to rabbi trust investments. Recourse Status [Domain] Recourse Status [Domain] Calculation of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Trading Symbol Trading Symbol Letters of credit outstanding Outstanding Letters of Credit Letters of Credit Outstanding, Amount Investment crediting rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Investment Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Investment Crediting Rate Number of Counterparties Greater than 10% of Net Exposure Number Of Counterparties Greater Than Ten Percent Of Net Exposure [Member] Number of counterparties greater than 10% of net exposure. Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] 2029 and thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Asset Impairments Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Industry of Counterparty [Domain] Industry of Counterparty [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Distributions to Exelon Distributions to member Payments of Distributions to Affiliates Collection of DPP, net Collection of DPP, net Proceeds from Collection of Retained Interest in Securitized Receivables Gross benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Actuarial (gain) loss Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Total Lessor, Operating Lease, Payment to be Received Proceeds from NDT fund sales Proceeds from NDT fund sales Proceeds from Sale and Maturity of Other Investments Impairment or Disposal of Tangible Assets Disclosure [Abstract] Impairment or Disposal of Tangible Assets Disclosure [Abstract] Equity Equity, Attributable to Parent [Abstract] Schedule of Changes in Ownership Interest [Line Items] Schedule of Changes in Ownership Interest [Line Items] Schedule of Changes in Ownership Interest [Line Items] Beginning Balance Ending Balance Contract with Customer, Liability Outstanding commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Renewable Power Generation Renewable Power Generation [Member] Renewable Power Generation [Member] Service cost Defined Benefit Plan, Service Cost One-time charges Other Cost and Expense, Operating, One-time Charges (Reversals) Other Cost and Expense, Operating, One-time Charges (Reversals) Purchased power and fuel from affiliates Purchased power and fuel from affiliates Related Party Transaction, Amounts of Transaction 2026 Other Commitment, to be Paid, Year Three Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] 2027 Lessor, Operating Lease, Payment to be Received, Year Four Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Level 1 Fair Value, Inputs, Level 1 [Member] Carrying Amount Reported Value Measurement [Member] Forward gas price Fair Value Inputs Forward Gas Price Assets This element represents the forward power market price used to calculate the change in fair value of the derivative instrument. Property, Plant, and Equipment Property, Plant and Equipment [Table Text Block] Equity Components [Axis] Equity Components [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Distribution to member Distribution to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Revolver facility Aggregate Bank Commitments Under Unsecured Revolving Credit Facilities Aggregate bank commitments as of the balance sheet date under a credit facility agreement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity. 2025 Long-Term Debt, Maturity, Year Two Qualified NDT fund income and losses Effective Income Tax Rate Reconciliation, Qualified Decommissioning Investment Income, Percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to qualified decommissioning investment income taxes paid. Revenues recognized Contract with Customer, Liability, Revenue Recognized, Including Opening Balance Contract with Customer, Liability, Revenue Recognized, Including Opening Balance Nuclear fuel Amortization of Nuclear Fuel Entity Small Business Entity Small Business Average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Unamortized energy contract assets, current Energy Marketing Contracts Assets, Current 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four Plant in service Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Local Phone Number Local Phone Number Term SOFR Rate Term SOFR Rate [Member] Term SOFR Rate Long-term debt assumed by buyer Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Notational amount Derivative, Notional Amount Measurement Frequency [Axis] Measurement Frequency [Axis] Other property, plant, and equipment Other Capitalized Property Plant and Equipment [Member] Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Retirement Plan Type [Domain] Retirement Plan Type [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Property, plant, and equipment Depreciation Retirement Benefits [Abstract] Retirement Benefits [Abstract] Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Economic Hedges Economic Hedges [Member] Economic Hedges [Member] Maximum annual assessment payment mandated by Price-Anderson Act for a nuclear incident Nuclear Insurance Financial Protection Pool Maximum Annual Assessment Payment Maximum annual payment of the assessment per nuclear reactor for a nuclear incident, under the financial protection pool mandated by the Price-Anderson Act. This payment is made by each United States nuclear reactor operator over multiple years in the event of an incident at any United States nuclear reactor, until the total assessment has been fully paid. Quad Cities Quad Cities [Member] Quad Cities [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Line of Credit Facility [Table] Line of Credit Facility [Table] Transaction Type [Axis] Transaction Type [Axis] Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Changes in equity of noncontrolling interest Changes in equity of noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) Offsetting fair value of in-the-money contracts under master netting arrangements Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Schedule of Variable Interest Entities Variable Interest Entity Disclosure - Summary of Unconsolidated Variable Interest Entity [Table Text Block] Variable Interest Entity Disclosure - Summary of Unconsolidated Variable Interest Entity [Table Text Block] Taxes accrued Accrued Income Taxes, Current DOE receivable - noncurrent Nontrade Receivables, Noncurrent Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Total operating revenues Revenues recognized Revenues Revenues Deferred debits and other assets Other Assets, Noncurrent [Abstract] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Allowance for other credit losses Allowance for Credit Loss, Receivable, Other, Current Fair Value Assets Liabilities Measured on Recurring Basis [Table] Fair Value Assets Liabilities Measured on Recurring Basis [Table] Summarization of information required and determined to be disclosed concerning assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis. Short-term Debt [Line Items] Short-Term Debt [Line Items] Contract Liabilities [Roll Forward] Contract with Customer, Liability [Abstract] Contract liabilities reclassified as held for sale Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Award Type [Axis] Award Type [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Payables related to Regulatory Agreement Units Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Regulatory Agreement Units, Payables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Regulatory Agreement Units, Payables Common stock dividends Dividends, Common Stock Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Hedging Designation [Axis] Hedging Designation [Axis] Total property, plant, and equipment Property, Plant and Equipment, Gross ROU assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Related Party Transactions Related Party Transactions Disclosure [Text Block] Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Pension and non-pension postretirement benefit plans valuation adjustment Pension and non-pension postretirement benefit plans valuation adjustment Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, after Tax Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Long-term incentive plan Long-term Incentive Plan Long-term Incentive Plan Other current liabilities Operating Lease, Liability, Current Non-pension postretirement benefit obligations Defined Benefit Plan, Non-Pension Benefit Obligation Defined Benefit Plan, Non-Pension Benefit Obligation 2026 Lessee, Operating Lease, Liability, to be Paid, Year Three Estimated targeted annual pre-tax return on nuclear decommissioning funds Assumed Returns on NDT Funds Pre-Tax Assumed Returns on NDT Funds Pre-Tax Net Finite-Lived Intangible Assets, Net Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Deferred tax valuation allowance SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Planned contributions Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Current year actuarial (gain) loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax, Current Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax, Current Counterparty Name [Domain] Counterparty Name [Domain] Asset, notational amount Derivative Asset, Notional Amount Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Renewable energy credits Renewable energy credits Renewable Energy Credits, Current Renewable Energy Credits, Current NER NER [Member] NER 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Long-Term Debt, including amounts due within one year Debt Instrument, Fair Value Disclosure Total Decommissioning-related activities Decommissioning Related Activities Decommissioning Related Activities Effect of netting and allocation of 
collateral Effects of Netting and Allocation of Collateral [Member] Effects of Netting and Allocation of Collateral [Member] Private credit Private Credit Funds [Member] Private Credit Funds Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Consideration Cash paid for purchase price Business Combination, Consideration Transferred Security Exchange Name Security Exchange Name Schedule of line of credit, short term, and long term debt [Line Items] Schedule of line of credit, short term, and long term debt [Line Items] Schedule of line of credit, short term, and long term debt [Line Items] Number of potentially responsible parties Loss Contingency, Number Of Potentially Responsible Parties Loss Contingency, Number Of Potentially Responsible Parties 2029 and beyond Other Commitment, to be Paid, after Year Five Accumulated other comprehensive income (loss), net Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Collateral Posted [Domain] Collateral Posted [Domain] Collateral Posted [Domain] OCI before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Retirement of long-term debt to affiliate Retirement of long-term debt to affiliate Retirement of Long-term Debt Due to Affiliate Retirement of Long-term Debt Due to Affiliate Total operating expenses Costs and Expenses Settlement charges Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Maximum Maximum [Member] Consideration received or due Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Jointly Owned Electric Plant Schedule Of Jointly Owned Electric Utility Plant [Text Block] Describes that the entity has a proportionate interest in a jointly owned utility plant. Should include a table showing separately for each interest the amount of plant in service, the accumulated provision for depreciation (if available), the amount of plant under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Should include statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. Should state that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power then should disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums [Member] Guarantees other than letters of credit and nuclear insurance, including parental guarantees on behalf of subsidiaries and guarantees on surety bonds, performance contracts, energy marketing contracts, trust preferred securities, leases and indemnifications. 2027 Other Commitment, to be Paid, Year Four Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization Total depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net Document Type Document Type Long-term Contract for Purchase of Electric Power Long-term Contract for Purchase of Electric Power [Member] Long-term Contract for Purchase of Electric Power Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Goodwill resulting from acquisition of STP Goodwill, Acquired During Period Settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Accelerated depreciation Restructuring and Related Cost, Accelerated Depreciation Actuarial loss reclassified to periodic benefit cost Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Net increase due to cost assumptions Increase (Decrease) in ARO Due to Updated Cost Assumptions Increase (Decrease) in ARO Due to Updated Cost Assumptions Tax credit carryforward Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Thereafter Long-Term Debt, Maturity, after Year Five Inventories Inventory, Policy [Policy Text Block] Mark-to-market derivative liabilities Mark-to-market derivative liabilities Mark-to-market derivative liabilities (current) Derivative Liability, Current Nuclear decommissioning activities Deferred Tax Liabilities, Nuclear Decommissioning Activities Deferred Tax Liabilities, Nuclear Decommissioning Activities Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Current Current Federal Tax Expense (Benefit) Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other non-cash operating activities Other non-cash operating activities Other Noncash Income (Expense) November 21, 2019(November 21, 2022) BilateralNov2019c [Member] BilateralNov2019c [Member] Business Acquisition [Axis] Business Acquisition [Axis] Former ComEd units Nuclear Plant [Member] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Schedule of Commercial Paper, Credit Facilities and Borrowing Rates Schedule of Line of Credit Facilities [Table Text Block] Derivative [Table] Derivative [Table] Deferred Deferred State and Local Income Tax Expense (Benefit) Variable Rate [Axis] Variable Rate [Axis] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Cash Cash [Member] 2024 Lessor, Operating Lease, Payment to be Received, Year One Operating revenues Operating revenues Revenue from Contract with Customer, Including Assessed Tax Title of 12(b) Security Title of 12(b) Security Financial Institutions Financial institutions [Member] Financial institutions Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Sale of Accounts Receivable Sale of Accounts Receivable [Member] Sale of Accounts Receivable Pension and OPEB obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Pension Plan Obligations, Noncurrent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Pension Plan Obligations, Noncurrent Actuarial loss/(gain), net Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Sublease income Sublease Income Related Party [Domain] Related Party, Type [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Mergers, Acquisitions, and Dispositions [Line Items] Mergers, Acquisitions, and Dispositions [Line Items] Mergers, Acquisitions, and Dispositions Equity interest Subsidiary, Ownership Percentage, Noncontrolling Owner Operating Segments Operating Segments [Member] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Share-Based Payment Arrangement [Abstract] Ownership interest Jointly Owned Utility Plant, Proportionate Ownership Share Entity Tax Identification Number Entity Tax Identification Number Commodity derivative liabilities subtotal Commodity Derivative Liabilites [Member] Commodity Derivative Liabilites [Member] Total lease costs Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Operating revenues Revenues [Member] This element represents the gains (losses) included in earnings that are recognized in operating revenues. Qualified Plan Qualified Plan [Member] Non-investment grade External Credit Rating, Non Investment Grade [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Return per annum CENG Preferred Distribution Return CENG Preferred Distribution Return Schedule of Business Acquisitions and Dispositions [Table] Schedule of Business Acquisitions and Dispositions [Table] Schedule of Business Acquisitions and Dispositions Entity Interactive Data Current Entity Interactive Data Current Maximum recovery, aggregate Mutual Replacement Power Cost Insurance Maximum Retrospective Premium Obligation This represents the maximum annual retrospective premium obligation that can be assessed to each member by an industry mutual insurance company in the event of a major accidental outage at a power plant incurred by any individual members. Beginning balance Ending balance Asset retirement obligation Asset Retirement Obligation Other non-cash operating activities Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] 2025 Other Commitment, to be Paid, Year Two Remaining lease terms Lessor, Operating Lease, Term of Contract Average contract term Average Contract Term Average Contract Term Deferred income taxes and unamortized ITCs Deferred income taxes and unamortized ITCs Deferred Income Taxes and Other Tax Liabilities, Noncurrent Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Member’s equity Members' Equity [Abstract] Special distribution Payments of Capital Distribution Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Total net capacity (in megawatts) Non Recourse Debt Megawatts Nuclear Decommissioning Byron Nuclear Decommissioning Byron [Member] Nuclear Decommissioning Byron Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Net increase due to revisions to projected decommission schedule Increase (Decrease) in ARO Due to Updated Cost Escalation Rates and Discount Rates Increase (Decrease) in ARO Due to Updated Cost Escalation Rates and Discount Rates Equity investments with readily determinable fair values Equity Securities, FV-NI Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Fair Value of Derivatives with Credit- Risk Related Contingent Features Fair Value of Derivatives with Credit- Risk Related Contingent Features [Table Text Block] [Table Text Block] Fair Value of Derivatives with Credit- Risk Related Contingent Features [Table Text Block] [Table Text Block] Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] May 15, 2020 BilateralMay2020 [Member] BilateralMay2020 Lessee, Operating Lease, Supplemental Cash Flow Information Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block] Lessee, Operating Lease, Supplemental Cash Flow Information 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Share-based Payment Arrangement, Cost by Plan Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Common stock, shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Net Exposure Net Exposure [Member] Net counterparty exposure after application/netting of collateral. Interest cost Defined Benefit Plan, Interest Cost Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Auditor Location Auditor Location Reduction to net income Other Cost and Expense, Operating Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Retirement Benefits Retirement Benefits [Text Block] Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Derivatives and other financial instruments Deferred Tax Assets, Derivative Instruments Internally rated — investment grade Internal Investment Grade [Member] Nuclear Fuel Amortization Accelerated nuclear fuel amortization Nuclear Fuel Amortization The amount of capitalized nuclear fuel costs that are charged to fuel expense during the period using the unit-of-production method. Maximum aggregate annual retrospective premium obligation Mutual Insurance Total Retrospective Premium Obligation Total annual retrospective premium obligation under insurance from an industry mutual insurance company. Cash equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Schedule of Jointly Owned Utility Plants Schedule of Jointly Owned Utility Plants [Table Text Block] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Net cash flows provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Actual long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Actual Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Actual Long-term Rate of Return on Plan Assets Cash collections received on DPP and reinvested in the Facility Cash Flows Between Transferor and Transferee, Beneficial Interest Interest Rate Swap Interest Rate Swap [Member] Debt Instrument [Axis] Debt Instrument [Axis] Mark-to-market derivative liabilities Mark-to-market derivative liabilities Mark-to-market derivative liabilities (noncurrent) Derivative Liability, Noncurrent Credit Facility [Axis] Credit Facility [Axis] Letters of credit posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Exelon Consolidation Exelon Consolidation [Member] Exelon Consolidation Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Total liabilities Total liabilities Total liabilities Liabilities (Gain) loss on sale of receivables Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Claim Types [Domain] Claim Types [Domain] Claim Types Measurement Frequency [Domain] Measurement Frequency [Domain] Property, Plant, and Equipment Property, Plant and Equipment Disclosure [Text Block] Contract Liability Contract Liability [Member] Contract Liability 2026 Lessor, Operating Lease, Payment to be Received, Year Three Operating and maintenance Operating and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Variable Interest Entities by Interest Type [Domain] Variable Interest Entities by Interest Type [Domain] Accounts Payable Accounts Payable [Member] Commercial Agreement VIEs Commercial Agreement VIE [Member] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Reclassification, Type [Axis] Reclassification, Type [Axis] Debt and Equity Security Investments Marketable Securities, Policy [Policy Text Block] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Property, plant, and equipment, net Public Utilities, Property, Plant and Equipment, Net Affiliated Entities Affiliated Entity [Member] Collateral received (posted), net Increase (Decrease) Cash Collateral from Counterparties Commodity derivative assets subtotal Commodity Derivative Assets [Member] Commodity Derivative Assets [Member] Annual recovery Public Utilities, Approved Rate Increase (Decrease), Amount Weighted Average Interest Rate on Commercial Paper Borrowings Short-Term Debt, Weighted Average Interest Rate, at Point in Time Current Current State and Local Tax Expense (Benefit) Nuclear decommissioning trust funds Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Decommissioning Fund Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Decommissioning Fund Investments Total current assets Assets, Current Other Receivables, Net, Current Other Receivables, Net, Current [Member] Other Receivables, Net, Current Cash equivalents Cash Equivalents NDT [Member] Cash Equivalents NDT [Member] Bonuses Non-Performance Charges, Redistributed Bonuses Non-Performance Charges, Redistributed Bonuses Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Asset Impairment Charges Asset Impairment Charges Investments in equities Equity Securities [Member] Supplemental cash flow information Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Net decrease due to changes in assumed retirement dates Increase (Decrease) in ARO Due to Changes in Assumed Retirement Dates Increase (Decrease) in ARO Due to Changes in Assumed Retirement Dates Fair value of net plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Equities Defined Benefit Plan, Equity Securities [Member] Acquisition of CENG noncontrolling Interest Noncontrolling Interest, Acquisition of Minority Interest Noncontrolling Interest, Acquisition of Minority Interest Restructuring Type [Axis] Restructuring Type [Axis] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Payable for tax liabilities upon separation Other Liabilities Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Common stock repurchased (in shares) Common stock repurchased (in shares) Stock Repurchased During Period, Shares Schedule of Changes in Ownership Interest Schedule of Changes in Ownership Interest [Table Text Block] Schedule of Changes in Ownership Interest Schedule Of Changes In Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other Exelon Business Services Co Affiliate [Member] Exelon Business Services Co Affiliate [Member] Exelon Business Services Co Related Party Affiliate Employee benefit trusts and investments Investments State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Granted (in dollars per share) Weighted average grant date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Five Discounted Cash Flow Valuation, Income Approach [Member] OPEB Other Postretirement Benefits Plan [Member] South Texas Project South Texas Project [Member] South Texas Project Other ownership interests in VIE Other Nonconsolidated Variable Interest Entity Ownership Interests The carrying value of other ownership interests as of the balance sheet date. Net cash flows provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Other Other [Member] Other [Member] Pension and non-pension postretirement benefit plans: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Prior service (credit) cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Gain (loss) on sales of assets and businesses Total operating expenses Gain (Loss) on Disposition of Other Assets Mark-to-market derivatives—Economic hedges Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Investment crediting rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Investment Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Investment Crediting Rate Allowance for credit losses SEC Schedule, 12-09, Allowance, Credit Loss [Member] Commercial Paper Commercial Paper [Member] Consolidation Items [Axis] Consolidation Items [Axis] Mergers, Acquisitions, and Dispositions [Abstract] Mergers, Acquisitions, and Dispositions Settlements Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Available Capacity Line of Credit Facility, Capacity Available for Trade Purchases Nuclear Plant [Axis] Nuclear Plant [Axis] Plants used in connection with the generation of nuclear energy by plant. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Number of years used in present value measurement Number Of Years Used In Present Value Measurement Number of years that measurement of the obligation at the present value of the future estimated costs and an annual average accretion of the ARO occurs. SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Losses on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Related Party Transactions - Noncurrent Receivables from/Payables to Affiliates Related Party Transactions - Noncurrent Receivables from/Payables to affiliates [Table Text Block] Related Party Transactions - Noncurrent Receivables from/Payables to affiliates [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Open Claims Open Claims [Member] Open Claims Deferred income taxes and unamortized investment tax credits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Equity investments without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Other Commitments Other Commitments [Table Text Block] Total estimated future benefits payments through 2033 Defined Benefit Plan, Expected Future Benefit Payments Total The total amount of the benefits expected to be paid in the future. Disclosure of Credit Derivatives Disclosure of Credit Derivatives [Table Text Block] Less: Cash proceeds received Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total deferred credits and other liabilities Deferred Credits and Other Liabilities Entity Emerging Growth Company Entity Emerging Growth Company Change from net loss attributable to membership interest and transfers from noncontrolling interest Change from net income (loss) attributable to ownership interest and transfers from Noncontrolling Interest Change from Net Income (Loss) Attributable to Ownership Interest and Transfers from Noncontrolling Interest Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 0 Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Real estate Real Estate Funds [Member] Exelon Corporate Parent Company [Member] Construction work in progress Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress Components of Operating Lease Income Operating Lease, Lease Income [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Purchased power and fuel Purchased power and fuel Cost, Direct Material 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Consolidated VIEs - Assets and Liabilities Assets and Liabilities of Variable Interest Entity [Table Text Block] Variable Interest Entity Disclosure - Summary of Consolidated Variable Interest Entity - Assets and Liabilities of Variable Interest Entity [Table Text Block] Separation from Parent Separation From Parent [Policy Text Block] Separation From Parent Net decrease due to increase in discount rates Increase (Decrease) in ARO Due to Increase in Discount Rates Increase (Decrease) in ARO Due to Increase in Discount Rates Common Stock Common Stock [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Net realized income on NDT funds - Non-Regulatory Agreement Units Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Nonregulatory Accounting This item represents investment income and realized gains (losses) for the period as a result of selling marketable securities held in nuclear decommissioning trust funds classified as trading securities. Income Statement Location [Domain] Income Statement Location [Domain] Constellation Energy Generation, LLC Constellation Energy Generation, LLC [Member] Constellation Energy Generation, LLC [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Unamortized debt discount and premium, net Debt Instrument, Unamortized Discount (Premium), Net Estimated annual after-tax return on nuclear decommissioning funds Assumed Returns on NDT Funds Assumed Returns on NDT Funds Mark-to-market derivative assets Mark-to-market derivative assets Mark-to-market derivative assets (noncurrent) Derivative Asset, Noncurrent Undistributed vested awards (in shares) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Floor rate Non Recourse Debt Minimum Rate Non Recourse Debt Minimum Rate Average blended interest rate Debt, Weighted Average Interest Rate Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Environmental loss contingencies Accrual for Environmental Loss Contingencies, Component Amount Minimum Minimum [Member] Contract with Customer, Prior Year Contract Revenues Recognized in Current Year Contract with Customer, Prior Year Contract Revenues Recognized in Current Year [Table Text Block] Contract with Customer, Prior Year Contract Revenues Recognized in Current Year Property, plant, and equipment (net of accumulated depreciation and amortization of $17,423 and $16,726 as of December 31, 2023 and 2022, respectively) Property, plant, and equipment (net of accumulated depreciation and amortization of $17,423 and $16,726 as of December 31, 2023 and 2022, respectively) Property, plant and equipment, net Property, Plant and Equipment, Net Collateral Collateral [Member] Collateral [Member] Comprehensive income (loss) Other comprehensive income (loss), net of income taxes Net current-period OCI Other Comprehensive Income (Loss), Net of Tax Disposal Group Classification [Axis] Disposal Group Classification [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Beginning balance Ending balance Defined Benefit Plan, Benefit Obligation STP Nuclear Operating Company STP Nuclear Operating Company [Member] STP Nuclear Operating Company ASSETS Assets [Abstract] Commodity Contract Commodity Contract [Member] Issuance of long-term debt Retirement of long-term debt Proceeds from Issuance of Long-Term Debt 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Summary of the Derivative Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] ABO Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Other Current Assets Other Current Assets [Member] Nuclear Insurance Premiums Nuclear Insurance Premiums [Member] Retrospective nuclear insurance premiums related to ANI under the Price-Anderson Act and participation in NEIL Increase (decrease) in PP&E related to ARO update Increase (decrease) in PP&E related to ARO update Costs Incurred, Asset Retirement Obligation Incurred Deferred income taxes Deferred income taxes Deferred Income Tax Assets, Net Net cash flows provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Retirement Plan Type [Axis] Retirement Plan Type [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Other investing activities Other investing activities Payments for (Proceeds from) Other Investing Activities Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Retained Earnings (Deficit) Retained Earnings [Member] Long-term debt due within one year Long-Term Debt, Current Maturities Supplemental Balance Sheet Information [Table] Supplemental Balance Sheet Information [Table] Schedule disclosing additional information about a registrants assets and liabilities in their statement of financial position. Energy cooperatives and municipalities Energy cooperatives and municipalities [Member] Energy cooperatives and municipalities External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Other income and (deductions) Operating income (loss) Nonoperating Income (Expense) [Abstract] Claim Type [Axis] Claim Type [Axis] Claim Type Basic (in dollars per share) Earnings Per Share, Basic Accounting Policies [Abstract] Accounting Policies [Abstract] August 12, 2022 BilateralAug2022a [Member] BilateralAug2022a Severance costs Restructuring Costs (Gain) loss on sale of assets and businesses Gain (Loss) on Disposition of Assets Pension plan assets Beginning balance Ending balance Defined Benefit Plan, Plan Assets, Amount Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Period Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Period Asset retirement obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Private equity Private Equity Funds [Member] Gross benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Variable Interest Entities by Interest Type [Axis] Variable Interest Entities by Interest Type [Axis] CRP CRP [Member] CRP[Member] Pension obligations Pension obligations Liability, Defined Benefit Pension Plan, Noncurrent Economic hedges Economic Hedging Instrument [Member] Economic Hedging Instrument [Member] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Advance notice period Put Option Exercise, Advance Notice Period Put Option Exercise, Advance Notice Period Undistributed vested awards (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Weighted Average Exercise Price Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Weighted Average Exercise Price Document Transition Report Document Transition Report Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Unsecured notes Unsecured Debt [Member] CenterPoint Energy Houston Electric, LLC CenterPoint Energy Houston Electric, LLC. [Member] CenterPoint Energy Houston Electric, LLC. Life Insurance Contracts 6311 Life Insurance [Member] Netting Netting [Member] Netting [Member] Amounts owed to co-owners Accounts Payable, Other, Current Deferred pension and postretirement obligation Deferred Tax Assets, Deferred Pension And Other Postretirement Benefit Obligation Deferred Tax Assets, Deferred Pension And Other Postretirement Benefit Obligation Equities Equity Securities Nuclear Decommissioning Trust Fund [Member] Equity Securities Nuclear Decommissioning Trust Fund Tax-exempt notes Tax Exempt Notes [Member] Tax Exempt Notes Related Party, Name [Axis] Related Party, Name [Axis] Related Party, Name Entity Public Float Entity Public Float Accrued Expenses [Abstract] Accrued Liabilities [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Nonnuclear Decommissioning Asset Retirement Obligation Nonnuclear Decommissioning Asset Retirement Obligation [Member] Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Investor-owned utilities, marketers, power producers Investor-owned utilities, marketers, power producers [Member] Investor-owned utilities, marketers, power producers Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Total long-term debt Long-Term Debt, Gross Unrealized gain (loss) on cash flow hedges Unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Liability Class [Axis] Liability Class [Axis] Unamortized Energy Contracts Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] October 25, 2019 BilateralOct2019a [Member] BilateralOct2019a [Member] Production tax credits and other credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Repayments of short-term borrowings with maturities greater than 90 days Repayments of short-term borrowings with maturities greater than 90 days Repayments of Short-Term Debt, Maturing in More than Three Months Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Total fair value of performance shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Fair Value of Settled Performance Share Awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Fair Value of Settled Performance Share Awards Collateral posted (received) from counterparties Derivative, Fair Value, Amount Offset Against Collateral, Net ZEC revenue recognized Revenue Recognized, Zero Emissions Credits Receivable Revenue Recognized, Zero Emissions Credits Receivable Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Deferred credits and other liabilities Other Liabilities, Noncurrent [Abstract] West Lake West Lake [Member] West Lake [Member] Total mark-to-market derivative assets Commodity derivative assets Derivative Asset Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Subsequent Event Type [Axis] Subsequent Event Type [Axis] Other decommissioning-related activity Other Decommissioning Related Activity Gain (Loss) This item represents realized and unrealized gains (losses) for the period as a result of selling and holding marketable securities in nuclear decommissioning trust funds. Additionally, this item includes the elimination of operating revenues, asset retirement obligation accretion, asset retirement cost amortization, investment income and income taxes related to nuclear decommissioning trust fund activity. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Contributions from Exelon Proceeds from Contributions from Parent Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Prior period income tax adjustment Effective Income Tax Rate Reconciliation, Prior Period Income Taxes Adjustment Effective Income Tax Rate Reconciliation, Prior Period Income Taxes Adjustment Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Acquisition-related adjustment Defined Benefit Plan, Plan Assets, Business Combination Accrued undiscounted amounts, environmental liabilities Accrual for Environmental Loss Contingencies, Gross 2024 Long-Term Debt, Maturity, Year One Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Equity method investments(a) Other Equity Method Investments [Member] Other Equity Method Investments [Member] Other Other Nonoperating Income Asset Retirement Obligation Rollforward Schedule of Change in Asset Retirement Obligation [Table Text Block] Assumed exercise and/or distributions of stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Nonrecourse debt Debt Instrument, Collateral Amount Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Net unrealized (losses) gains from CTV investments Equity Securities, FV-NI, Unrealized Gain (Loss) Increase (decrease) in capital expenditures not paid Increase (decrease) in capital expenditures not paid Change in Capital Expenditures Incurred But Not Yet Paid The non cash impact of change in capital expenditures incurred but not yet paid. Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference [Text Block] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] LIBOR LIBOR [Member] LIBOR Total deferred debits and other assets Deferred Costs and Other Assets Document Period End Date Document Period End Date Potomac Electric Power Co Affiliate [Member] Potomac Electric Power Co Affiliate [Member] Potomac Electric Power Co Affiliate [Member] Options to extend the term Lessee, Operating Lease, Option to Extend, Term Lessee, Operating Lease, Option to Extend, Term Compensation-related accruals Accrued Compensation Current Carrying value as of the balance sheet date of obligations incurred and payable for payroll, employee benefits, incentive compensation and vacation. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). State rate changes and tax positions Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount, State Rate Changes and Tax Positions Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount, State Rate Changes and Tax Positions AEP Texas, Inc. AEP Texas, Inc. [Member] AEP Texas, Inc. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Income tax (benefit) expense Income tax (benefit) expense Total income tax (benefit) expense Income Tax Expense (Benefit) Deferred compensation obligation Deferred Compensation Liability, Current and Noncurrent Alternative investments Alternative Investments [Member] Alternative Investments Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Pre-tax impairment charge Impairment of Long-Lived Assets to be Disposed of Valuation allowance on state tax attributes Operating Loss Carryforwards, Valuation Allowance Equity [Abstract] Equity [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Other accounts receivable (net of allowance for credit losses of $5 as of December 31, 2023 and 2022) Other accounts receivable (net of allowance for credit losses of $5 as of December 31, 2023 and 2022) Other Other Receivables, Net, Current Included in Payables related to Regulatory Agreement Units Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Gain (Loss) Included In Noncurrent Payables To Affiliates Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Gain (Loss) Included In Payables To Regulatory Agreement Units, Noncurrent Pension obligations Liability, Defined Benefit Plan 2025 Lessor, Operating Lease, Payment to be Received, Year Two Net fair value changes related to derivatives Net fair value changes related to derivatives Gains (Losses) Unrealized Gain (Loss) on Derivatives Actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Asset retirement obligations Asset retirement obligations Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Share-Based Payment Arrangement, Performance Shares, Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Federal general business credits carryforwards and other carryforwards Tax Credit Carryforward, Amount Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Acquisition of business Payments to Acquire Businesses, Net of Cash Acquired Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Credit Facility [Domain] Credit Facility [Domain] Change in collateral Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral Fair value measurement with unobservable inputs reconciliation recurring basis asset liability gain loss change in collateral. Renewables 2020 ExGenRenewablesIVDec2020 [Member] ExGenRenewablesIVDec2020 Basis spread Debt Instrument, Basis Spread on Variable Rate Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Expected life Average Service Life (years) Property, Plant and Equipment, Useful Life Total deferred income tax liabilities (net) and unamortized ITCs Deferred Income Tax Liabilities And Accumulated Deferred Investment Tax Credit, Net The sum of the cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax, and the noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. Investment grade External Credit Rating, Investment Grade [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defaulting Market Participant and Settlement of Regulatory Matters Defaulting Market Participant and Settlement of Regulatory Matters [Member] Defaulting Market Participant and Settlement of Regulatory Matters Non-pension postretirement benefit obligations Non-pension postretirement benefit obligations Liability, Other Postretirement Defined Benefit Plan, Noncurrent Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Total Other Commitment Contract with Customer, Contract Asset, Contract Liability, and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Regulated Operations [Abstract] Regulated Operations [Abstract] Proprietary trading Proprietary Trading Liabilities [Member] Proprietary Trading Liabilities [Member] Document Annual Report Document Annual Report Nuclear fuel Nuclear Fuel [Member] Purchases, sales, issuances and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Equity in income (losses) of unconsolidated affiliates Equity in income (losses) of unconsolidated affiliates Income (Loss) from Equity Method Investments Cover [Abstract] Liquidity Facility Liquidity Facility [Member] Liquidity Facility Billings to related party Related Party Transaction, Billings to Related Party Related Party Transaction, Billings to Related Party Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Solar project entities Solar project entities [Member] Solar project entities Fair Value, Recurring Fair Value, Recurring [Member] PECO Energy Co PECO Energy Co [Member] PECO Energy Co [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Other Other noncurrent liabilities Other Liabilities, Noncurrent Total lease payments Lessee, Operating Lease, Liability, to be Paid Cash Flow Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Customer accounts receivable sold into the Facility Transfer of Financial Assets Accounted for as Sale, Additional Transfers Amount of derecognized financial assets from transactions which comprise an additional transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition. Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Other, net Other Nonoperating Income (Expense) [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Noncontrolling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Segment Information Segment Reporting Disclosure [Text Block] Increase (decrease) in DPP Increase (decrease) in DPP Supplemental Deferred Purchase Price Natural Gas Natural Gas [Member] Project Finance Secured Debt [Member] Equity Component [Domain] Equity Component [Domain] Revenues recognized Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress State State and Local Jurisdiction [Member] Total contributions Payment for Pension and Other Postretirement Benefits Other, net Deferred Tax Liabilities, Other Fixed rates Non Recourse Fixed Rate Member [Member] Non Recourse Fixed Rate Member [Member] Entity Current Reporting Status Entity Current Reporting Status Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] Total receivables sold Accounts Receivable, Sale Unrealized mark-to-market gains (losses) Marketable Security, Unrealized Gain (Loss) Acquisition of noncontrolling interest Acquisition of noncontrolling interest Noncontrolling Interest, Increase from Business Combination Gain (loss) on sales of assets and businesses Operating Income (Loss) Total AOCI Including Portion Attributable to Noncontrolling Interest [Member] Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Collateral Posted [Axis] Collateral Posted [Axis] Collateral Posted Facility Closing Facility Closing [Member] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Forward gas basis (in dollars per share) Forward Gas Basis Basis adjustment to the forward gas price to deliver at an illiquid location Plan participants' contributions Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Constellation New England Constellation New England [Member] Represents the New England segment of Constellation Energy Generation. Nuclear insurance liability limit per incident Nuclear Insurance Annual Coverage Limit Annual coverage limit provided by the nuclear insurance arrangement for nuclear incident claims. Schedule of Government Settlement Agreements Schedule of Government Settlement Agreements [Table Text Block] Schedule of Government Settlement Agreements [Table Text Block] Total equity Beginning Balance Ending Balance Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Fair Value Estimate of Fair Value Measurement [Member] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Other comprehensive income (loss), net of income taxes Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Peach Bottom Units 2 and 3 Peach Bottom Units 2 and 3 [Member] Peach Bottom Units 2 and 3 Actuarial loss reclassified to periodic cost Actuarial loss reclassified to periodic benefit cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Scenario [Domain] Scenario [Domain] Loan Facility Draws Long-Term Line of Credit Customer Relationships Customer Relationships [Member] PHI Pepco Holdings LLC Affiliate [Member] Pepco Holdings LLC Affiliate [Member] Type of Restructuring [Domain] Type of Restructuring [Domain] Accounts receivable Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Renewables 2017 ExGenRenewablesIVNov2024 [Member] ExGenRenewablesIVNov2024 [Member] Taxes Directly Imposed on Revenue-Producing Transactions Revenue, Transaction Price Measurement, Tax Exclusion [Policy Text Block] Deferred income taxes and amortization of ITC Deferred income taxes and amortization of ITCs Deferred Income Taxes and Tax Credits Net liabilities excluded Net Liabilities Pending Transactions Excluded Net Liabilities Pending Transactions Excluded Consolidated Entities [Axis] Consolidated Entities [Axis] Variable Rate [Domain] Variable Rate [Domain] Net income (loss) attributable to noncontrolling interests Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Nuclear fuel - work in progress Nuclear Fuel Fabrication And Installation Stage Nuclear Fuel that is in fabrication and installation stage. Entity Voluntary Filers Entity Voluntary Filers Benefit Eligibility Age Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term to Benefit Eligibility Age Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term to Benefit Eligibility Age Statistical Measurement [Domain] Statistical Measurement [Domain] Liability, notational amount Derivative Liability, Notional Amount Peach Bottom Peach Bottom [Member] Nuclear generation facility located in Peach Bottom Township, PA. Operating Revenues Revenue from Contract with Customer, Including Assessed Tax [Member] Revenue from Contract with Customer, Including Assessed Tax Materials and supplies Materials and supplies Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Forward power basis (in dollars per share) Forward Power Basis Basis adjustment to the forward power price to deliver at an illiquid location. Beginning Balance (in shares) Ending Balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information. Debt and Credit Agreements Debt Disclosure [Text Block] Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Electric Electric Generation Equipment [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Total Exposure Before Credit Collateral Fair Value, Concentration of Risk, Maximum Amount of Loss [Member] Relating to assets sold during the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Assets Sold During Period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Assets Sold During Period Syndicated Revolver Revolving Credit Facility [Member] Matching contributions to savings plan Defined Contribution Plan, Employer Discretionary Contribution Amount Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Amortization of energy contract assets and liabilities Amortization of Power Contracts Emission Credits Deferred pension and postretirement obligation Deferred Tax Liabilities, Deferred Pension And Other Postretirement Benefit Obligation The amount as of the balance sheet date of the estimated future tax effects attributable to the deferred pension and other postretirement benefit obligation. Volatility percentage Derivative Asset (Liability) Net, Measurement Input Total Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Performance Shares Performance Shares [Member] Accounts payable Accounts payable and accrued expenses Accounts Payable, Current Segment Reporting [Abstract] Segment Reporting [Abstract] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Investment, Name [Axis] Investment, Name [Axis] Total other income and (deductions) Nonoperating Income (Expense) Open claims Loss Contingency, Pending Claims, Number U.S. federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Nuclear financial protection pool value Nuclear Insurance Financial Protection Pool Value Total funds available for nuclear insurance liability claims in a financial protection pool mandated by the Price-Anderson Act. Value of additional stock authorized for repurchase Stock Repurchase Program, Additional Amount to be Repurchased Stock Repurchase Program, Additional Amount to be Repurchased Commitments and contingencies (Note 19) Commitments and contingencies (Note 19) Commitments and Contingencies Nuclear Decommissioning Nuclear Decommissioning [Member] Represents estimated future nuclear decommissioning costs that exceed (regulatory asset) or are less than (regulatory liability) the associated decommissioning trust fund assets. Public Utility [Axis] Public Utility [Axis] Cash Collateral and Letters of Credit on Derivative Contracts Cash Collateral and Letters of Credit on Derivative Contracts [Table Text Block] Cash Collateral and Letters of Credit on Derivative Contracts [Table Text Block] Delmarva Power and Light Co Affiliate [Member] Delmarva Power and Light Co Affiliate [Member] Delmarva Power and Light Co Affiliate [Member] Requisite service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Non-service net periodic benefit credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs, Excluding Capitalization and Reclassification Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs, Excluding Capitalization and Reclassification Variable rates Non Recourse Variable Rate [Member] Non Recourse Variable Rate [Member] Income Taxes Income Tax Disclosure [Text Block] 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Minimum coverage limit Nuclear Insurance Minimum Coverage Limit Nuclear Insurance Minimum Coverage Limit Leases Lessee, Leases [Policy Text Block] Property, plant, and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Revenues Revenue [Policy Text Block] The amount of total gains (losses) included in income attributed to the change in unrealized losses related to assets and liabilities Total unrealized gains (losses) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Annual depreciation rate Property Plant And Equipment Depreciation As Percent Of Average Service Life Rate Annual depreciation provision as a percentage of average service life for property, plant and equipment service category. Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] ERCOT Constellation ERCOT [Member] Weighted Average Grant Date Fair Value (per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Inventories, net Inventories, net Inventory, Net [Abstract] Gross fair value of derivative contracts containing this feature Derivative Liability, Subject to Master Netting Arrangement, before Offset Hedging Relationship [Axis] Hedging Relationship [Axis] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Goodwill [Roll Forward] Goodwill [Roll Forward] Total cumulative cash reimbursements Spent Nuclear Fuel Storage Reimbursement Total of allowed cash reimbursements for received for costs incurred from the Department of Energy under the settlement agreement for spent nuclear fuel storage costs that have been incurred due to the delay in the Department of Energy accepting spent nuclear fuel. Maximum recovery limit from a nuclear industry mutual insurance company in the event of multiple losses Mutual Property Insurance Maximum Recovery Limit For Multiple Losses This represents the maximum total recovery for all losses by all insureds of an industry mutual insurance company in the event of multiple losses by multiple insureds within a twelve-month period. Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year One Leases Lessor, Operating Leases [Text Block] Unamortized ITCs Accumulated Deferred Investment Tax Credit Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Nuclear Plant [Domain] Nuclear Plant [Domain] Represents the names of individual nuclear power plants in which the company owns or has an interest. NDT fund investments Investments, Fair Value Disclosure Accumulated depreciation Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation Pension and non-pension postretirement benefit plans Other Comprehensive Income (Loss), Tax Net income (loss) attributable to membership interest Net Income (Loss) Net Income (Loss) Total current liabilities Liabilities, Current Net cumulative cash reimbursements Spent Nuclear Fuel Storage Reimbursement Net Co Owners Total of allowed cash reimbursements received for cost incurred from the Department of Energy under the settlement agreement for spent nuclear fuel storage costs that have been incurred due to the delay in the Department of Energy accepting spent nuclear fuel after considering amounts due to co-owners. Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Leases Lessee, Operating Leases [Text Block] Net increase (decrease) in operating and maintenance expense Increase (Decrease) in Utilities Operating Expense Maintenance Operations And Other Costs And Expenses Increase (Decrease) in Utilities Operating Expense Maintenance Operations And Other Costs And Expenses Accounting Implications of the Regulatory Agreement Units Decommissioning Related Activities [Policy Text Block] Decommissioning Related Activities Long-term debt Debt and Lease Obligation Albany Green Energy biomass facility Albany Green Energy biomass facility [Member] Albany Green Energy biomass facility LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Common stock repurchased Common stock repurchased Stock Repurchased During Period, Value Other one-time charges Other charges Asset Retirement Obligation, Revision of Estimate Payments of Distributions to Parent Payments of Distributions to Parent Payments of Distributions to Parent Total assets measured at fair value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Accounts receivable Accounts receivable Increase (Decrease) in Receivables Summary of Income Tax Examinations Summary of Income Tax Examinations [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Separation from Parent Separation from Parent [Member] Separation from Parent Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Proceeds from sales of assets and businesses Proceeds from sales of assets and businesses Proceeds from Sale, Property, Held-for-Sale Antelope Valley Solar Ranch One DOE Project Financing, 2.82% January 5, 2037 [Member] Pension And Other Postretirement Benefit Contributions Pension And Other Postretirement Benefit Contributions [Table Text Block] This element may be used to capture the amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. Goodwill Beginning balance Ending balance Goodwill Percentage to be settled as common stock Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Stock Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Stock Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis [Table] Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis [Table] Summarization of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Measurement Basis [Axis] Measurement Basis [Axis] Total Restructuring and Related Cost, Incurred Cost Midwest Constellation Midwest [Member] Represents the Midwest segment of Exelon Corporation and Exelon Generation Company, LLC. Shareholders' Equity Comprehensive Income (Loss) Note [Text Block] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Spent Nuclear Fuel Obligation [Line Items] Spent Nuclear Fuel Obligation [Line Items] [Line Items] for Spent Nuclear Fuel Obligation [Table] Forecast Forecast [Member] Transaction [Domain] Transaction [Domain] Change in short-term borrowings Change in short-term borrowings Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Other deferred credits and other liabilities Operating Lease, Liability, Noncurrent Debt instrument term Debt Instrument, Term Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Net realized and unrealized (gains) losses on NDT funds Net realized and unrealized (gains) losses on NDT funds Realized and Unrealized Gain (Loss) on Investments Realized and Unrealized Gain (Loss) on Investments Income Statement Location [Axis] Income Statement Location [Axis] Supplemental Balance Sheet Information Related to Lessee Right-of-Use Assets and Lease Liabilities Supplemental Balance Sheet Information Related to Lessee Right-of-Use Assets and Lease Liabilities [Table Text Block] Supplemental Balance Sheet Information Related to Operating and Finance Lease Right-of-Use Assets and Lease Liabilities Total after-tax stock-based compensation expense Share-Based Payment Arrangement, Expense, after Tax Asset Retirement Obligations Asset Retirement Obligation and Environmental Cost [Policy Text Block] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Equity Investment VIEs Equity Investment VIE [Member] Equity Investment VIE [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Purchased power and fuel Cost, Direct Material [Member] Total costs incurred and are directly related to energy commodities and services provided during the reporting period. Variation margin Margin Deposit Assets Healthcare cost trend on covered charges Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Healthcare Cost on Covered Charges, Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Healthcare Cost on Covered Charges, Rate Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Options to extend the term Lessor, Operating Lease, Option to Extend, Term Lessor, Operating Lease, Option to Extend, Term Amortization of Intangible Assets Included in Depreciation Expense Amortization of Intangible Assets Included in Depreciation Expense [Member] Amortization of Intangible Assets Included in Depreciation Expense Defined Contribution Plan [Table] Defined Contribution Plan [Table] Pledged Status [Axis] Pledged Status [Axis] After 5 year period average rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, After Five Year Period Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, After Five Year Period Fair Value of Financial Liabilities Recorded at Amortized Cost Fair Value, by Balance Sheet Grouping [Table Text Block] Product and Service [Domain] Product and Service [Domain] Payables related to Regulatory Agreement Units Payables related to Regulatory Agreement Units Payable to Regulatory Agreement Units, Noncurrent Payable to Regulatory Agreement Units, Noncurrent Cash collateral posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Components of Lease Cost Lease, Cost [Table Text Block] Inventories Increase (Decrease) in Inventories Beginning Balance Ending Balance Contract with Customer, Asset, after Allowance for Credit Loss, Current Cash flows from investing activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] ARO, current obligation Asset Retirement Obligation, Current Investment in partnerships Deferred Tax Assets, Equity Method Investments Purchasers Purchasers [Member] Purchasers Asset divestitures Asset Retirement Obligation, Liabilities Settled Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Plan Name [Domain] Plan Name [Domain] Historical five-year annual average pre-tax return on NDT funds Return on Nuclear Decommissioning Funds, Historical Historical annual average after-tax return on NDT funds Interest expense, net Interest expense, net Interest Expense Unrecognized compensation costs Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Fixed income Fixed Income Securities [Member] Notes payable and other Notes Payable, Other Payables [Member] State State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Salem Salem [Member] Nuclear generation facility located in Hancock's Bridge, NJ. Use of Estimates Use of Estimates, Policy [Policy Text Block] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Decommissioning related activities Decommissioning Related Activities Not Contractually Offset The current period expense charged against earnings on decommissioning the Byron Units that are not contractually offset. Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Letters of credit Financial Standby Letter of Credit [Member] 2026 Long-Term Debt, Maturity, Year Three Reclassification, Type [Domain] Reclassification, Type [Domain] Internally rated — non-investment grade Internal Noninvestment Grade [Member] Auditor Firm ID Auditor Firm ID Amortization Expense Amortization of intangible assets, net Amortization of Intangible Assets Entity Shell Company Entity Shell Company Investments Investments Total investments Long-Term Investments Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Revenue not from contracts Revenue Not from Contract with Customer Income taxes Increase (Decrease) in Income Taxes Payable Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Cash, restricted cash, and cash equivalents at beginning of period Cash, restricted cash, and cash equivalents at end of period Total cash, restricted cash, and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Nonrecourse Nonrecourse [Member] Variable lease costs Variable Lease, Cost Operating lease costs Operating Lease, Cost Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Net increase (decrease) due to changes in, and timing of, estimated future cash flows Asset Retirement Obligation, Period Increase (Decrease) Severance costs Severance Costs Long-term debt due within one year Long-term debt due within one year Long-term debt due within one year Long-Term Debt and Lease Obligation, Current Total assets Assets, Fair Value Disclosure Loan balance Total Long-Term Debt 2027 Long-Term Debt, Maturity, Year Four Change in money pool with Exelon Increase (Decrease) in Money Pool with Affiliate Increase (Decrease) in Money Pool with Affiliate Foreign Currency Items Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Schedule Of Finite-Lived Intangible Assets Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Purchases and Sales of Accounts Receivable Purchases and Sales of Accounts Receivable [Table Text Block] Purchases and Sales of Accounts Receivable Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Remaining weighted-average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Other financing activities Other financing activities Proceeds from (Payments for) Other Financing Activities Comprehensive income (loss) attributable to membership interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Amortization of investment tax credit, including deferred taxes on basis differences Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Commitments And Contingencies [Table] Commitments And Contingencies [Table] Over (under) funded status (Plan assets less benefit obligations) Defined Benefit Plan, Funded (Unfunded) Status of Plan Change in performance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) Federal Domestic Tax Authority [Member] Entity Address, Address Line One Entity Address, Address Line One Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net [Abstract] Schedule of Changes in Ownership Interest [Table] Schedule of Changes in Ownership Interest [Table] Schedule of Changes in Ownership Interest Accounts payable and accrued expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Accounts Payable And Accrued Expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability, Accounts Payable And Accrued Expenses One time fee Spent Nuclear Fuel One Time Fee One-time fee applicable to nuclear generation through April 6, 1983 under the standard contracts with the Department of Energy which was elected to be deferred with interest until just prior to the first delivery of spent nuclear fuel to the Department of Energy. Pension and non-pension postretirement benefit costs Pension and Other Postretirement Benefits Cost (Reversal of Cost) Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Increase (decrease) in cash, restricted cash, and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Derivative instruments Total mark-to-market derivative net assets (liabilities) Derivative, Fair Value, Net Total recognized in AOCI Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Subsequent Event Subsequent Event [Member] State net operating losses and other carryforwards Operating Loss Carryforwards Contractual offset Asset Retirement Obligation Contractual Offset Asset Retirement Obligation Contractual Offset Supplemental Balance Sheet Information Supplemental Balance Sheet Information [Table Text Block] Supplemental Balance Sheet Information Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Other Other current liabilities Other Liabilities, Current Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Income Statement [Abstract] Income Statement [Abstract] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] November 21, 2019 BilateralNov2019b [Member] BilateralNov2019b [Member] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Total mark-to-market derivative liabilities Commodity derivative liabilities Derivative Liability Acquisition of joint ownership in STP Asset Retirement Obligation, Acquisitions Asset Retirement Obligation, Acquisitions Total Realized and Unrealized Gains (Losses) Included in Income for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] 2024 Other Commitment, to be Paid, Year One Membership interest Members' Capital Employee incentive plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Other Other Other current assets Other Assets, Current Asset Retirement Obligation Roll Forward Analysis [Table] Asset Retirement Obligation Roll Forward Analysis [Table] A table for the reconciliation of the nuclear decommissioning asset retirement obligation from the beginning of a period to the end of a period. Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Estimated Future Claims Estimated Future Claims [Member] Estimated Future Claims Membership Interest Membership Interest [Member] An ownership interest in a limited liability company. Private credit Private Credit [Member] Private Credit [Member] Equity method investments(a) Equity Method Investments Other Commitments [Domain] Other Commitments [Domain] Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] Net liabilities Fair Value Net Assets Liabilities Excluded From Nuclear Decommissioning Trust Fund Investments This element represents total net assets (liabilities) excluded from nuclear decommissioning trust fund investment total. The amount consists of payables related to pending securities purchases net of cash, interest receivables and receivables related to pending securities for the respective periods. DPP DPP consideration Retained Interest, Fair Value Disclosure Arithmetic Average Arithmetic Average [Member] Mark-to-Market Derivatives Derivative [Member] Realized gains (losses) Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Pension and non-pension postretirement benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] Proprietary Trading Not Designated as Hedging Instrument, Trading [Member] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Percent of additional decommissioning shortfall with recourse Uncollectible Decommissioning Shortfall Percentage Percent of additional decommissioning shortfall with recourse for collection from customers. Repurchases of common stock Payments for Repurchase of Common Stock Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Mergers, Acquisitions, and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Fixed income Fixed Income Funds [Member] Segments [Domain] Segments [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] November 20, 2019 BilateralNov2019a [Member] BilateralNov2019a [Member] Consolidation Items [Domain] Consolidation Items [Domain] Retained earnings (deficit) Undistributed earnings Retained Earnings (Accumulated Deficit) Bilaterals Bilateral Credit Agreements [Member] Bilateral Credit Agreements Transfers into Level 3 Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Notes Debt Instrument, Face Amount Current assets Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Options to terminate within Lessee, Operating Lease, Option to Terminate, Term Lessee, Operating Lease, Option to Terminate, Term Entity Address, State or Province Entity Address, State or Province Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Cash flows from operating activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Annual distribution, portion Mutual Property Insurance Distribution To Members Distribution by a nuclear industry mutual insurance company to its members. This distribution represents excess funds as a result of positive operating experience. Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Credit Collateral Credit Collateral [Member] Credit collateral associated with counterparty exposure. Disposal Group Name [Domain] Disposal Group Name [Domain] Effect of netting and allocation of collateral Effects of Netting and Allocation of Collateral Liabilites [Member] Effects of Netting and Allocation of Collateral Liabilites [Member] Solar Business Solar Business [Member] Solar Business Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Investments [Abstract] Long-Term Investments [Abstract] Allocation of federal benefits under tax sharing agreement Allocation Of Federal Tax Benefit Under Tax Sharing Agreement Federal income tax benefits allocated by a parent entity to its subsidiaries under a mutually agreed-upon tax sharing agreement, for which the goal is that the subsidiaries are responsible for the same amount of income tax expense or benefits that they would owe or receive had the subsidiary been separately subject to tax. Allocations of income tax benefits are treated as contributions of capital to the subsidiaries. Non-service components of pension benefits & OPEB credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs Continetal Wind Continetal Wind [Member] Debt issued for the funding of the ContinentalWindProject Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Asset Class [Domain] Asset Class [Domain] Pension obligations Defined Benefit Plan, Benefit Obligation Recognized from Result of Separation Defined Benefit Plan, Benefit Obligation Recognized from Result of Separation Net unrealized (losses) gains on NDT funds - Regulatory Agreement Units Unrealized Gain Loss Nuclear Decommissioning Trust Funds Regulatory Accounting This item represents unrealized gains (losses) for the period as a result of holding marketable securities held in nuclear decommissioning trust funds and classified as trading securities. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent PECO PECO Energy Co Affiliate [Member] Peco Energy Co Related Party Affiliate Pension and non-pension postretirement benefit contributions Pension and non-pension postretirement benefit contributions Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Income Taxes [Table] Income Taxes [Table] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Operating lease liabilities Operating Lease, Liability Interest cost Defined Benefit Plan, Interest Cost, Net Of Adjustments Defined Benefit Plan, Interest Cost, Net Of Adjustments Contributions from member Contribution from member Noncontrolling Interest, Increase from Subsidiary Equity Issuance Expected Retirement Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term to Expected Retirement Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term to Expected Retirement Acquisition of CENG noncontrolling interest Acquisition of CENG noncontrolling interest Payments to Acquire Noncontrolling Interests Payments to Acquire Noncontrolling Interests Purchase price Disposal Group, Including Discontinued Operation, Consideration Inventories, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Accumulated Other Comprehensive Income (Loss), net AOCI Attributable to Parent [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Audit Information [Abstract] Audit Information Net fair value of derivative contracts containing this feature Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Comprehensive income (loss), net of income taxes Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] DOE receivable - current Nontrade Receivables, Current Percentage to be settled as cash Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash Pension and Non-Pension Postretirement Benefit Plan Items Pension and non-pension postretirement benefit plans valuation adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Plan Name [Axis] Plan Name [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Letters of credit held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Income tax benefit Tax benefit on stock compensation Share-Based Payment Arrangement, Expense, Tax Benefit Number of reportable segments Number of Reportable Segments Earnings per average common share Earnings Per Share [Abstract] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Reserve for obsolete materials SEC Schedule, 12-09, Reserve, Inventory [Member] Common stock (No par value, 1,000 shares authorized, 317 shares and 327 shares outstanding as of December 31, 2023 and 2022, respectively) Common Stock, Value, Issued Costs incurred related to decommissioning plants Payments Asset Retirement Obligation, Cash Paid to Settle Related Party Transaction Capitalized Costs Support Services Related Party Transaction Capitalized Costs Support Services Capitalized costs incurred for support services. Assets measured at NAV Assets measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Early Plant Retirements Implications Of Potential Early Retirement Disclosure [Text Block] implications of potential early retirement disclosure [Text Block] Amortization of operating ROU asset Operating Lease, Right-of-Use Asset, Periodic Reduction Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total RNF Revenue Net Of Purchase Power And Fuel From External Customers, Including Other Revenue Net Of Purchase Power And Fuel From External Customers, Including Other Option  Model Option Model Valuation Technique [Member] Option model approach valuation technique used to measure fair value. Senior unsecured notes Senior Notes [Member] Deferred taxes on state tax attributes (net) Deferred Tax Assets, Operating Loss Carryforwards, State and Local Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block] This element represents, for the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). Forward power price Fair Value Inputs Forward Power Price Assets This element represents the forward power market price used to calculate the change in fair value of the derivative instrument. Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] 2028 Lessor, Operating Lease, Payment to be Received, Year Five Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other Revenue Net Of Purchase Power And Fuel From External Customers, Other Revenue Net Of Purchase Power And Fuel From External Customers, Other Other, net Other, net Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Depreciation and amortization Depreciation and amortization Cost, Depreciation and Amortization Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Value of stock authorized for repurchase Stock Repurchase Program, Authorized Amount MW of generation Capacity Of Facility Of Company Owned Solar Distribution Generation Facilities Capacity of facility of company owned solar distribution generation facilities. Amounts reclassified to receivables Contract with Customer, Asset, Reclassified to Receivable Number of decommissioning trust funds Number of Decommissioning Trust Funds Number of Decommissioning Trust Funds Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Prior service benefit reclassified to periodic benefit cost Prior service benefit reclassified to periodic benefit cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Income Tax Authority [Axis] Income Tax Authority [Axis] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Nuclear Plant Jointly Owned Nuclear Power Plant [Member] Supplemental Cash Flow Information [Table] Supplemental Cash Flow Information [Table] Schedule disclosing additional information about a registrants statement of cash flows Accrual-based contracts Deferred Tax Liabilities, Other Finite-Lived Assets Utility Plant [Domain] Utility Plant [Domain] Gross receipts Utilities Operating Expense, Taxes Public Utilities, Property, Plant and Equipment [Abstract] Public Utilities, Property, Plant and Equipment [Abstract] 2029 through 2033 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Schedule Of Goodwill Schedule of Goodwill [Table Text Block] Treasury interest rate Spent Nuclear Fuel Treasury Interest Rate Interest rate used to calculated interest accrued on one-time fee applicable to nuclear generation through April 6, 1983 under the standard contracts with the Department of Energy which was elected to be deferred with interest until just prior to the first delivery of spent nuclear fuel to the Department of Energy. The interest rate used is the 13-week Treasury Rate. Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Distributed Energy Company Distributed Energy Company [Member] Distributed Energy Company [Member] Investment in NDT funds Investment in NDT funds Payments to Acquire Other Investments SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Pre-tax increase in membership interest for purchase of EDF's 49.99% equity interest Payments to Acquire Additional Interest in Subsidiaries Other assets and liabilities Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Table] Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Table] Schedule that discloses total realized and unrealized gains/losses included in income for assets and liabilities with unobservable inputs measured on a recurring basis. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Rates Debt Instrument, Interest Rate, Stated Percentage Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Pre-tax gain on disposition Gain (Loss) on Disposition of Business Depreciation and Amortization Depreciation, Depletion, and Amortization [Policy Text Block] NRG Energy, Inc. NRG Energy, Inc. [Member] NRG Energy, Inc. Total shareholders’ equity Equity, Attributable to Parent Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Total net assets Fair Value, Net Asset (Liability) Nuclear Fuel Capitalization and Amortization of Fuel Costs, Policy [Policy Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Electricity Electricity [Member] Schedule of Defined Benefit Plans Disclosures Schedule of Defined Benefit Plans Disclosures [Table Text Block] Operating and maintenance from affiliates Operating and maintenance from affiliates Related Party Costs, Operating and Maintenance Related Party Costs, Operating and Maintenance Related Party Costs, Operating and Maintenance Unbilled customer revenues Unbilled Contracts Receivable Hedging Designation [Domain] Hedging Designation [Domain] Other current liabilities Liability, Defined Benefit Plan, Current Net realized income on NDT funds - Regulatory Agreement Units Realized Gain Loss Investment Income Nuclear Decommissioning Trust Funds Regulatory Accounting This item represents investment income and realized gains (losses) for the period as a result of selling marketable securities held in nuclear decommissioning trust funds and classified as trading securities. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Level 2 Fair Value, Inputs, Level 2 [Member] Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Pension Plan and Other Postretirement Benefits Plan Pension Plan and Other Postretirement Benefits Plan [Member] Pension Plan and Other Postretirement Benefits Plan Implications of Potential Early Plant Retirements [Abstract] Implications of Potential Early Plant Retirements [Abstract] Implications of Potential Early Plant Retirements [Abstract] Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1) Incremental Collateral For Loss Of Investment Grade Credit Rating Incremental collateral amount required to be provided related to its financial instruments, including derivatives, non-derivatives, normal purchase normal sales contracts and applicable payables and receivables, if the credit rating is downgraded below investment grade. Amortization of prior service (cost) credit Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Total net identifiable assets, at fair value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Economic Hedges (Commodity Price Risk) Derivative Instruments, Gain (Loss) [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Outstanidng Commercial Paper Line of Credit Facility, Remaining Borrowing Capacity 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Impacts of separation Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Impact From Separation Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Impact From Separation Foreign Foreign Tax Authority [Member] Asset Retirement Obligation Roll Forward Analysis [Line Items] Asset Retirement Obligation Roll Forward Analysis [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Operating license renewal period Operating License Renewal Period Operating License Renewal Period MW of generation Capacity Of Facility Of Company Owned Generation Facilities Capacity Of Facility Of Company Owned Generation Facilities City Area Code City Area Code Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract] Jointly Owned Utility Plant, Net Ownership Amount [Abstract] Product and Service [Axis] Product and Service [Axis] Fitzpatrick Fitzpatrick [Member] Fitzpatrick [Member] Notational amount, debt Non Recourse Debt Interest Rate Swap Non Recourse Debt Interest Rate Swap Ownership interest Equity Method Investment, Ownership Percentage Tax loss carryforward, net of valuation allowances Deferred Tax Assets, Tax Credit Carryforwards, General Business Document Fiscal Year Focus Document Fiscal Year Focus Remaining lease terms Lessee, Operating Lease, Term of Contract Retirement Benefits Compensation Related Costs, Policy [Policy Text Block] Software and Software Development Costs Software and Software Development Costs [Member] Receivables [Abstract] 5 year period average rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, Five Year Period Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase, Five Year Period Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Other Power Regions  Constellation Other Regions [Member] Interest expense to affiliates Interest expense to affiliates Related Party Transaction, Interest Expense Related Party Transaction, Interest Expense Nine Mile Point Unit 2 Nine Mile Point [Member] Nine Mile Point [Member] March 29, 2023 BilateralMar2023 [Member] BilateralMar2023 Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Supplemental Financial Information Supplemental Financial Information Disclosure [Text Block] Element designated to encapsulate the entire footnote disclosure that provides information on the supplemental income statement, cash flow and balance sheet activities. Nonrelated Party Nonrelated Party [Member] Change in Contract with Customer, Asset [Abstract] Change in Contract with Customer, Asset [Abstract] Product and Service, Other Product and Service, Other [Member] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Income taxes (net of refunds) Income Taxes Paid, Net Annual average accretion of the ARO Asset Retirement Obligation Accretion Rate Asset Retirement Obligation Accretion Rate ITC amortization Investment Tax Credit Amortization Investment Tax Credit Amortization Unrealized gain (loss) on foreign currency translation Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Separation-related adjustments Separation-related adjustments Adjustments to Additional Paid in Capital, Separation From Parent Adjustments to Additional Paid in Capital, Separation From Parent Separation-related adjustment Defined Benefit Plan, Plan Assets, Separation Related Adjustments Defined Benefit Plan, Plan Assets, Separation Related Adjustments Total liabilities and equity Liabilities and Equity Other Other Other deferred debits and other assets Other Assets, Noncurrent Ownership [Domain] Ownership [Domain] Operating lease ROU assets Operating Lease, Right-of-Use Asset Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule Of Taxes Excluding Income And Excise Taxes Schedule Of Taxes Excluding Income And Excise Taxes [Table Text Block] This element may be used to capture the table showing the different components of taxes excluding income and excise taxes. Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Nuclear Fleet Nuclear Fleet [Member] Nuclear Fleet Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Total member’s equity Members' Equity Entity Address, City or Town Entity Address, City or Town Plan participants' contributions Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Related Party Related Party [Member] Predecessor Member's Equity Predecessor Member's Equity [Member] Predecessor Member's Equity Antelope Valley Antelope Valley [Member] Antelope Valley is a wholly owned indirect subsidiary of EGR IV Separation-related adjustment Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Separation Related Adjustments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Separation Related Adjustments Billings from related party Related Party Transaction, Billings from Related Party Related Party Transaction, Billings from Related Party Asset Impairments Asset Impairment Charges [Text Block] Remaining repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Common stock, shares authorized (in shares) Common Stock, Shares Authorized Other available for sale debt security investments Debt Securities, Available-for-Sale Increase (decrease) in ARO for impacts of revised decommissioning cost estimates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Document Information [Table] Document Information [Table] Related Party, Name [Domain] Related Party, Name [Domain] Related Party, Name [Domain] Short Term Loan Agreements Term Loan [Member] Term Loan Short-term borrowings Short-term borrowings Short-Term Debt Net realized and unrealized (gains) losses on equity investments Net realized and unrealized (gains) losses on equity investments Equity Securities, FV-NI, Gain (Loss) Return to provision adjustment Decommissioning Related Activities, Return to Provision Adjustment Decommissioning Related Activities, Return to Provision Adjustment Contributions from Exelon Contributions from member Proceeds from Contributions from Affiliates Proceeds from new transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Atlantic City Electric Co Affiliate [Member] Atlantic City Electric Co Affiliate [Member] Atlantic City Electric Co Affiliate [Member] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Derivative [Line Items] Derivative [Line Items] Total assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Comprehensive income (loss) attributable to noncontrolling interests Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Cash collateral held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Other Commitments [Axis] Other Commitments [Axis] Tax Effects of Temporary Differences Summary of Deferred Tax Liability Not Recognized [Table Text Block] Acquisition-related adjustment Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Document Information [Line Items] Document Information [Line Items] Proprietary trading Proprietary Trading [Member] Energy-related derivative contracts entered into purely to profit from market prices changes as opposed to hedging an exposure. Pledged Status [Domain] Pledged Status [Domain] Number of counterparties Number of Counterparties Represents number of counterparties with a concentrated credit risk greater than 10% of net exposure. Schedule of Bilateral Credit Agreements Schedule Of Credit Agreement Covenants [Table Text Block] Schedule provides information about credit agreement covenants as of the period end. Deferred tax adjustment related to acquisition of CENG noncontrolling interest Deferred tax adjustment related to acquisition of CENG noncontrolling interest Decrease in membership interest due to deferred tax liabilities resulting from purchase of EDF's equity interest Deferred Tax Liability Adjustment - Noncontrolling Interest Deferred Tax Liability related to CENG Put Surety bonds Surety Bond [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Income Taxes Income Tax, Policy [Policy Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Non-Qualified Pension Plans Nonqualified Pension Plan [Member] Nonqualified Pension Plan Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Prior service (credit) cost Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Related Party [Axis] Related Party, Type [Axis] Employee incentive plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Renewable energy credit obligation Renewable energy credit obligation Energy Marketing Accounts Payable Credit facility term Line of Credit Facility, Expiration Period 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Noncontrolling interests Equity, Attributable to Noncontrolling Interest Asbestos-related bodily injury claims Liability for Asbestos and Environmental Claims, Gross Auditor Name Auditor Name Accumulated depreciation and amortization Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Disposal Group Name [Axis] Disposal Group Name [Axis] Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Cash collections reinvested in the Facility Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers Retirement of long-term debt Retirement of long-term debt Repayments of Long-Term Debt Net increase due to higher estimated decommissioning costs Increase (Decrease) in ARO Due to Reversal of Early Retirement Increase (Decrease) in ARO Due to Reversal of Early Retirement Entity Central Index Key Entity Central Index Key Settlements Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Relating to assets still held as of the reporting date Included in net income (loss) Total gains (losses) included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Total stock-based compensation expense included in operating and maintenance expense Share-Based Payment Arrangement, Expense Gross Finite-Lived Intangible Assets, Gross Nuclear decommissioning trust funds Nuclear decommissioning trust funds Decommissioning Fund Investments Restricted cash Restricted cash [Member] Restricted cash [Member] Income Tax Authority [Domain] Income Tax Authority [Domain] Income tax benefit related to separation adjustment Other Comprehensive Income (Loss), Tax, Separation Adjustment Other Comprehensive Income (Loss), Tax, Separation Adjustment Summary of Loss Carryforwards Summary of Operating Loss Carryforwards [Table Text Block] Interest rate, debt hedge Non Recourse Debt Hedge Percentage Accretion expense ARO accretion Asset Retirement Obligation, Accretion Expense Payroll Other Labor-related Expenses Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Nuclear Decommissioning Trust Fund Investments NDT fund investments subtotal NDT Fund Investments Nuclear Decommissioning Trust Fund Investments [Member] This element represents the assets measured at fair value on a recurring basis related to nuclear decommissioning trust fund investments. Total Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Amortization of actuarial (loss) gain Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Baltimore Gas And Electric Company Affiliate [Member] Baltimore Gas And Electric Company Affiliate [Member] Baltimore Gas and Electric Related Party Affiliate Entity [Domain] Entity [Domain] Net Exposure of Counterparties Greater than 10% of Net Exposure Net Exposure Of Counterparties Greater Than Ten Percent Of Net Exposure [Member] Net exposure of counterparties greater than 10% of net exposure. Spent Nuclear Fuel Obligation [Table] Spent Nuclear Fuel Obligation [Table] Spent Nuclear Fuel Obligation [Table] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] No Additional Collateral Posted No Additional Collateral Posted [Member] No Additional Collateral Posted Spent nuclear fuel obligation Spent nuclear fuel obligation SNF Obligation Spent Nuclear Fuel Obligation, Noncurrent Legal Entity [Axis] Legal Entity [Axis] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Interest (net of amount capitalized) Interest Paid, Excluding Capitalized Interest, Operating Activities Net unrealized (losses) gains on NDT funds - Non-Regulatory Agreement Units Unrealized Gain Loss Nuclear Decommissioning Trust Funds Nonregulatory Accounting This item represents unrealized gains (losses) included in earnings for the period as a result of holding marketable securities held in nuclear decommissioning trust funds and classified as trading securities. Energy-related options Energy Related Options Represents the reclassification of energy-related option premiums to realized at settlement of contracts recorded in results of operations due to the settlement of the underlying transaction. Long-term debt Long-term debt Long-term debt Long-Term Debt, Excluding Current Maturities Actual return (loss) on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Deferred income tax liabilities (net) Deferred Tax Liabilities, Net Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Economic Hedges Not Designated as Hedging Instrument, Economic Hedge [Member] Assets, Total Assets, Total [Member] Expected long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Rate of Return on Plan Assets Separation-related adjustment Defined Benefit Plan, Separation Related Adjustments Defined Benefit Plan, Separation Related Adjustments Operating expenses Operating expenses Operating Expenses [Abstract] Total realized / unrealized gains (losses) Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss [Abstract] This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3). Variable lease income Operating Lease, Variable Lease Income Capital expenditures Capital expenditures Payments to Acquire Property, Plant, and Equipment Long Term Incentive Plan Long Term Incentive Plan [Member] Long Term Incentive Plan [Member] Shortfall of decommissioning funds with recourse Uncollectible Decommissioning Shortfall Amount of decommissioning shortfall with recourse for collection from customers. Payables to affiliates Accounts Payable, Interest-Bearing, Noncurrent Wind project entities Wind project entities [Member] Wind project entities 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total assets Total assets Total assets Assets Pension plans Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 2028 Long-Term Debt, Maturity, Year Five Recourse Recourse [Member] New York Constellation New York [Member] Segment Reconciling Items Segment Reconciling Items [Member] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Construction work in progress Construction in Progress [Member] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Pension Benefits Pension Plan [Member] Cash flows from financing activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Cash collateral posted (received) Cash Collateral Posted (Received) Cash collateral received related to credit risk. 2028 Other Commitment, to be Paid, Year Five Employee benefit trusts and investments Employee Benefit Trusts and Investments [Member] Employee Benefit Trusts and Investments [Member] Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Total Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Natural gas, oil, and emission allowances Natural gas, oil, and emission allowance Energy Related Inventory, Natural Gas in Storage City of Austin City of Austin [Member] City of Austin Debt Instrument [Line Items] Debt Instrument [Line Items] Scenario [Axis] Scenario [Axis] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Unamortized debt issuance costs Unamortized Debt Issuance Expense Significant Accounting Policies Additional Narrative Information [Table] Significant Accounting Policies Additional Narrative Information [Table] Significant Accounting Policies Additional Narrative Information [Table] ComEd Commonwealth Edison Co Affiliate [Member] Commonwealth Edison Co Affiliate. Schedule of Short-term Debt Schedule of Short-Term Debt [Table] Plant basis differences Deferred Tax Liabilities, Property, Plant and Equipment Operating revenues Revenues [Abstract] Revenues [Abstract] Other available for sale debt security investments Other Available For Sale Investments [Member] Other Available For Sale Investments [Member] Cash paid during the year Cash Paid (Refunded) During the Year [Abstract] Cash Paid (Refunded) During the Year Constellation Renewables Constellation Renewables [Member] Constellation Renewables [Member] Receivables from and payables to affiliates, net Increase (Decrease) in Due to Related Parties Statement [Line Items] Statement [Line Items] West Medway II, LLC West Medway II, LLC [Member] West Medway II, LLC Mid-Atlantic Constellation Mid Atlantic [Member] Represents the Mid-Atlantic segment of Exelon Corporation and Exelon Generation Company, LLC. Unamortized energy contract assets, noncurrent Energy Marketing Contracts Assets, Noncurrent Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] Noncontrolling Interests Noncontrolling Interest [Member] Conversion ratio Separation From Parent, Conversion Ratio Separation From Parent, Conversion Ratio