Nuclear decommissioning trust funds Decommissioning Fund Investments Economic hedges Economic Hedging Instrument Liabilites [Member] Economic Hedging Instrument Liabilites [Member] Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Customer [Domain] Customer [Domain] Letter of credit Letter of Credit [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] 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) Income Taxes [Line Items] Income Taxes [Line Items] Receivable Type [Axis] Receivable Type [Axis] Byron Dresden Byron Dresden [Member] Byron Dresden Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] 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 (paid) received, 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. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total mark-to-market derivative liabilities Commodity derivative liabilities Derivative Liability Security Exchange Name Security Exchange Name Contract with Customer, Contract Asset, Contract Liability, and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Regulatory Agency [Domain] Regulatory Agency [Domain] Other current liabilities Liability, Defined Benefit Plan, Current Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Discounted Cash Flow Valuation, Income Approach [Member] Deferred compensation obligation Deferred Compensation Liability, Current and Noncurrent Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Operating lease income Operating Lease, Lease Income Extreme Cold Weather Conditions Extreme Cold Weather Conditions [Member] Extreme Cold Weather Conditions Income taxes Increase (Decrease) in Income Taxes Payable Letters of credit held Letters Of Credit Held Letters of credit held related to credit risk Gain on sales of assets and businesses Gain (Loss) on Disposition of Assets Number of sites Operations, Sites Across the Country Operations, Sites Across the Country Amortization of intangible assets, net Amortization of Intangible Assets 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. Cash collateral held Derivative, Collateral, Obligation to Return Cash Revenues recognized Contract with Customer, Liability, Revenue Recognized Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract] 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 RNF from external customers Revenue Net Of Purchase Power And Fuel From External Customers Amount of revenues net of purchased power and fuel expense from external customers. 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. Term to be paid Market Payment Shortfall in Collection, Term to be Paid Market Payment Shortfall in Collection, Term to be Paid Included in net income Total (losses) gains included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Internally rated — non-investment grade Internal Noninvestment Grade [Member] Award Type [Domain] Award Type [Domain] Local Phone Number Local Phone Number 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. Actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Other, net Other, net [Member] This element represents the gains (losses) included in earnings that recognized in Other, net. Disclosure of Credit Derivatives Disclosure of Credit Derivatives [Table Text Block] Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Undistributed Earnings Retained Earnings [Member] Amounts previously held-for-sale Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Long-Term Debt, including amounts due within one year Debt Instrument, Fair Value Disclosure Customer accounts receivable Trade Accounts Receivable [Member] RPG Nonrecourse Debt Renewable Power Generation [Member] Renewable Power Generation [Member] Utility Plant [Domain] Utility Plant [Domain] Cash collateral Cash Collateral for Borrowed Securities Real estate Real Estate Funds [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. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Qualified NDT fund income 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. Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Pension and non-pension postretirement benefit costs Pension and Other Postretirement Benefits Cost (Reversal of Cost) Due to affiliate Due to Related Parties Repayments of short-term debt Repayments of Short-term Debt Retirement Benefits Compensation Related Costs, Policy [Policy Text Block] Basic (in dollars per share) Earnings Per Share, Basic Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Document Information [Line Items] Document Information [Line Items] Regulatory Agency [Axis] Regulatory Agency [Axis] Consummation of separation (in shares) Adjustments, Consummation of Separation, Shares Issued Adjustments, Consummation of Separation, Shares Issued Related Party Debt Related Party Debt [Member] Related Party Debt Economic Hedges Economic Hedges [Member] Economic Hedges [Member] Receivables from and payables to affiliates, net Increase (Decrease) in Due to Related Parties Fair Value Measurement [Domain] Fair Value Measurement [Domain] Pension obligations Liability, Defined Benefit Pension Plan, Noncurrent Prepaid pension asset Assets for Plan Benefits, Defined Benefit Plan Commercial Paper Commercial Paper [Member] Other non-cash operating activities Other Noncash Income (Expense) Competitive Businesses Natural Gas Revenues Constellation All Other Segments [Member] Operating segments that do not meet the quantitative thresholds and thus are not classified as reportable segments for which there is an accounting requirement to report separate financial information on those components in the entity's financial statements. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] 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. Purchased power and fuel Purchased Power And Fuel [Member] Total costs incurred and are directly related to energy commodities and services provided during the reporting period. Long-term debt due within one year Long-term Debt and Lease Obligation, Current Plan Name [Axis] Plan Name [Axis] Level 1 Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Pledged Status [Domain] Pledged Status [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Cash and Cash Equivalents Cash and Cash Equivalents [Member] Transaction Type [Axis] Transaction Type [Axis] Scenario [Axis] Scenario [Axis] Not Designated as Hedging Instrument, Propriety Trading Not Designated as Hedging Instrument, Trading [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] Schedule of Defined Benefit Plans Disclosures Schedule of Defined Benefit Plans Disclosures [Table Text Block] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Unrecognized tax benefits that would impact effective tax rate if recognized Unrecognized Tax Benefits that Would Impact Effective Tax Rate Non-pension postretirement benefit obligations Defined Benefit Plan, Non-Pension Benefit Obligation Defined Benefit Plan, Non-Pension Benefit Obligation Intersegment Revenue Net Of Purchase Power And Fuel Intersegment Revenue Net Of Purchase Power And Fuel Segment Reporting Information, Intersegment Revenue Net of Purchased Power and Fuel Expense Interest Rate Swap Interest Rate Swap [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Mark-to-market derivative liabilities Mark-to-market derivative liabilities (current liabilities) Derivative Liability, Current Entity Interactive Data Current Entity Interactive Data Current Renewable energy credits Renewable Energy Credits, Current Renewable Energy Credits, Current NER NER [Member] NER Effect of netting and allocation of collateral Effects of Netting and Allocation of Collateral [Member] Effects of Netting and Allocation of Collateral [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Non-service net periodic benefit cost Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 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] Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Mark-to-market derivative assets Mark-to-market derivative assets (current assets) Derivative Asset, Current Entity Address, State or Province Entity Address, State or Province Damages sought Loss Contingency, Damages Sought, Value Other Other Fixed Income [Member] Other Fixed Income [Member] Retirement of long-term debt to affiliate Retirement of Long-term Debt Due to Affiliate Retirement of Long-term Debt Due to Affiliate Deferred income taxes Deferred Income Tax Assets, Net Current liabilities Liabilities, Current [Abstract] Receivable [Domain] Receivable [Domain] Investments in equities Equity Securities [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Foreign governments Debt Security, Government, Non-US [Member] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Derivative Instrument [Axis] Derivative Instrument [Axis] Document Transition Report Document Transition Report Property Real Estate Tax Expense Common stock (No par value, 1,000 shares authorized, 327 shares outstanding as of March 31, 2022) Common Stock, Value, Issued Remaining weighted average period Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Increase 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 of Financial Liabilities Recorded at Amortized Cost Fair Value, by Balance Sheet Grouping [Table Text Block] (Unfunded) funded status (net benefit obligation less plan assets) Defined Benefit Plan, Funded (Unfunded) Status of Plan Financial institutions Financial institutions [Member] Financial institutions Sale of Accounts Receivable Sale of Accounts Receivable [Member] Sale of Accounts Receivable Ownership [Axis] Ownership [Axis] Recourse Status [Domain] Recourse Status [Domain] Legal Entity [Axis] Legal Entity [Axis] Collection of DPP Proceeds from Collection of Retained Interest in Securitized Receivables Assumed exercise and/or distributions of stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] 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 Commodity derivative liabilities subtotal Commodity Derivative Liabilites [Member] Commodity Derivative Liabilites [Member] Operating revenues from affiliates Total operating revenues from affiliates Revenue from Related Parties Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Accrued expenses Accrued Liabilities, Current Entity [Domain] Entity [Domain] Cash proceeds received Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount Texas-based generating assets Texas-based generating assets [Member] Texas-based generating assets Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Actuarial loss reclassified to periodic cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Document Quarterly Report Document Quarterly Report Offsetting fair value of in-the-money contracts under master netting arrangements Derivative Liability, Collateral, Right to Reclaim Cash, Offset Unamortized energy contract assets, current Energy Marketing Contracts Assets, Current Variable Rate [Axis] Variable Rate [Axis] Receivables sold to Exelon's utility subsidiaries prior to the separation on February 1, 2022 Accounts Receivable, Related Parties, Sale Accounts Receivable, Related Parties, Sale Segment Information Segment Reporting Disclosure [Text Block] 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 Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Decommissioning-related activities Gain Loss Investment Income Nuclear Decommissioning Trust Funds This item represents the total investment income and realized and unrealized gains (losses) included in earnings for the period as a result of selling and holding marketable securities held in nuclear decommissioning trust funds and classified as trading securities. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Variable Rate [Domain] Variable Rate [Domain] Investment in NDT funds Payments to Acquire Other Investments Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Net Exposure Net Exposure [Member] Net counterparty exposure after application/netting of collateral. Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] LDC Damages LDC Damages [Member] LDC Damages Payroll Other Labor-related Expenses 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. Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Other, net Other Nonoperating Income (Expense) Other investing activities Payments for (Proceeds from) Other Investing Activities Facility Closing Facility Closing [Member] Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Increase (decrease) due to: Effective Income Tax Rate Reconciliation, Percent [Abstract] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Accounts receivable Increase (Decrease) in Receivables Award Type [Axis] Award Type [Axis] Exelon Consolidation Exelon Consolidation [Member] Exelon Consolidation Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Total shareholders’ equity Stockholders' Equity Attributable to Parent Claim Types [Domain] Claim Types [Domain] Claim Types City Area Code City Area Code Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Contract Liability Contract Liability [Member] Contract Liability Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Variable Interest Entities by Interest Type [Domain] Variable Interest Entities by Interest Type [Domain] Cash Flow Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Commercial Agreement VIEs Commercial Agreement VIE [Member] Average Arithmetic Average [Member] The amount of total gains (losses) included in income attributed to the change in unrealized gains (losses) related to assets and liabilities Total unrealized (losses) gains Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Market payment shortfall in collections Market Payment Shortfall in Collections Market Payment Shortfall in Collections Equity Stockholders' Equity Attributable to Parent [Abstract] Total deferred debits and other assets Total deferred credits and other liabilities Deferred Credits and Other Liabilities Non-pension postretirement benefit obligations Liability, Other Postretirement Defined Benefit Plan, Noncurrent Commodity derivative assets subtotal Commodity Derivative Assets [Member] Commodity Derivative Assets [Member] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Cash equivalents NDT Cash Equivalents NDT [Member] Cash Equivalents NDT [Member] Income tax benefit Share-based Payment Arrangement, Expense, Tax Benefit Operating Segments Operating Segments [Member] Industry of Counterparty [Domain] Industry of Counterparty [Domain] Variable lease income Operating Lease, Variable Lease Income Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Asset Class [Domain] Asset Class [Domain] Other BSC Exelon Business Services Co Affiliate [Member] Exelon Business Services Co Related Party Affiliate Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] 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. Income taxes Income Tax Expense (Benefit) Other Commitments [Domain] Other Commitments [Domain] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Other Other [Member] Other [Member] Customer accounts receivable (net of allowance for credit losses of $50 and $55 as of March 31, 2022 and December 31, 2021, respectively) Customer accounts receivable (net of allowance for credit losses of $50 and $55 as of March 31, 2022 and December 31, 2021, respectively) Customer Accounts Receivable, after Allowance for Credit Loss, Current Unsecured Debt Unsecured Debt [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Total current assets Assets, Current 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 Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Mergers, Acquisitions, and Dispositions [Abstract] Mergers, Acquisitions, and Dispositions Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 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] Equity Component [Domain] Equity Component [Domain] Open Claims Open Claims [Member] Open Claims Total estimated future benefits payments through 2031 Defined Benefit Plan, Expected Future Benefit Payments Total The total amount of the benefits expected to be paid in the future. Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Disposal Group Name [Domain] Disposal Group Name [Domain] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Market Participant [Axis] Market Participant [Axis] Market Participant Payables to affiliates Accounts Payable, Related Parties, Noncurrent Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] 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 Outstanding Commercial Paper as of Commercial Paper Recourse Recourse [Member] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Total Restructuring and Related Cost, Incurred Cost Total Other Commitment Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Expected generation hedged in next twelve months Expected Generation Hedged In Next Twelve Months The percent for the expected/target percentage of future generation being hedged at an electric generation company in the next twelve months. The percentage of expected generation hedged is calculated as the amount of equivalent sales divided by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash-flow hedges, other derivatives and certain non-derivative contracts including sales to affiliates to serve their retail load. Share-based Payment Arrangement, Cost by Plan Share-based Payment Arrangement, Cost by Plan [Table Text Block] 2023 Other Commitment, to be Paid, Year Two 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] Level 2 Fair Value, Inputs, Level 2 [Member] Separation from Exelon Separation From Parent [Policy Text Block] Separation From Parent Type of Restructuring [Domain] Type of Restructuring [Domain] Segment Reporting [Abstract] Segment Reporting [Abstract] Commodity Contract Commodity Contract [Member] 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. Constellation Energy Generation, LLC Constellation Energy Generation, LLC [Member] Constellation Energy Generation, LLC [Member] Title of 12(b) Security Title of 12(b) Security 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 Our ownership interest in VIE Investments In Nonconsolidated Variable Interest Entities This element represents the total investments in variable interest entities as of the balance sheet date. Deferred income taxes and amortization of investment tax credits Deferred Income Taxes and Tax Credits Common stock, shares authorized (in shares) Common Stock, Shares Authorized Collateral Collateral [Member] Collateral [Member] Pension plans Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Changes in equity of noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) Document Type Document Type Noncontrolling interests Members' Equity Attributable to Noncontrolling Interest Retirement Plan Tax Status [Axis] Retirement Plan Tax Status [Axis] Cash collateral received Cash Collateral Received Cash collateral received related to credit risk. Interest Rate Debt Instrument, Interest Rate, Stated Percentage Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Revolving Credit Facility Revolving Credit Facility [Member] 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. Measurement Frequency [Axis] Measurement Frequency [Axis] Energy cooperatives and municipalities Energy cooperatives and municipalities [Member] Energy cooperatives and municipalities Collateral posted (received) from counterparties Derivative, Fair Value, Amount Offset Against Collateral, Net Securitized funds allocation Securitized Funds Allocation Securitized Funds Allocation Claim Type [Axis] Claim Type [Axis] Claim Type Noncontrolling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Spent nuclear fuel obligation SNF Obligation Spent Nuclear Fuel Obligation, Noncurrent Payables to affiliates: Due to Related Parties, Current Amortization of operating ROU asset Operating Lease, Right-of-Use Asset, Amortization Expense Total liabilities Financial Liabilities Fair Value Disclosure Hedging Relationship [Axis] Hedging Relationship [Axis] Mergers, Acquisitions, and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Credit facility term Line of Credit Facility, Expiration Period Cash collateral posted Derivative, Collateral, Right to Reclaim Cash Unbilled customer revenues Unbilled Contracts Receivable Unrealized gains (losses) Unrealized Gain (Loss) on Investments Variable Interest Entities by Interest Type [Axis] Variable Interest Entities by Interest Type [Axis] EGRP CRP [Member] CRP[Member] Net cash flows (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Economic hedges Economic Hedging Instrument [Member] Economic Hedging Instrument [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Equity in losses of unconsolidated affiliates Income (Loss) from Equity Method Investments Reduction to net income Other charges Other Cost and Expense, Operating Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Netting Netting [Member] Netting [Member] Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Exelon Utility Registrants Affiliates Exelon Utility Registrants Affiliates [Member] Exelon Utility Registrants Affiliates 2022 Other Commitment, to be Paid, Year One Equities NDT Equity Securities Nuclear Decommissioning Trust Fund [Member] Equity Securities Nuclear Decommissioning Trust Fund Litigation liability Estimated Litigation Liability, Current Surety bonds Surety Bond [Member] Investor-owned utilities, marketers, power producers Investor-owned utilities, marketers, power producers [Member] Investor-owned utilities, marketers, power producers Derivative [Table] Derivative [Table] Total member’s equity Members' Equity Net fair value of derivative contracts containing this feature Derivative Liability, Fair Value, Amount Offset Against Collateral Operating revenues Revenues [Abstract] Unamortized Energy Contracts Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] Accrued undiscounted amounts Accrual for Environmental Loss Contingencies, Gross Document Period End Date Document Period End Date Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Fixed income subtotal Fixed Income Securities [Member] Total receivables sold Accounts Receivable, Sale Proceeds from new transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Consolidated Entities [Domain] Consolidated Entities [Domain] State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent West Lake West Lake [Member] West Lake [Member] Debt instrument term Debt Instrument, Term Income Statement Location [Domain] Income Statement Location [Domain] Revenue Net of Purchase Power And Fuel Revenue Net of Purchase Power And Fuel Amount of total revenues net of purchased power and fuel expense for Generation Investments, fair value disclosure Investments, Fair Value Disclosure 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. DPP Retained Interest, Fair Value Disclosure Volatility percentage Derivative Asset (Liability) Net, Measurement Input Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Property, plant, and equipment (net of accumulated depreciation and amortization of $16,007 and $15,873 as of March 31, 2022 and December 31, 2021, respectively) Property, plant and equipment, net Property, Plant and Equipment, Net Total AOCI Including Portion Attributable to Noncontrolling Interest [Member] Purchased power and fuel Cost, Direct Material Retirement of long-term debt Repayments of loan Repayments of Long-term Debt Earnings per average common share Earnings Per Share [Abstract] Repayments of related party debt Repayments of Related Party Debt Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Net unrealized losses on equity investments Net unrealized (losses) gains from equity investments Equity Securities, FV-NI, Unrealized Gain (Loss) Total operating revenues Revenues recognized Total operating revenues Revenues Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 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. Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net [Abstract] Pepco Potomac Electric Power Co Affiliate [Member] Potomac Electric Power Co Affiliate [Member] 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). Public Utility Commission of Texas Public Utility Commission of Texas [Member] Public Utility Commission of Texas Long-term debt to affiliates Due to Affiliate, Noncurrent Investment grade External Credit Rating, Investment Grade [Member] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Letters of credit Financial Standby Letter of Credit [Member] Entity Current Reporting Status Entity Current Reporting Status Pension plan assets Defined Benefit Plan, Plan Assets, Amount Nuclear fuel Amortization of Nuclear Fuel Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Planned contributions Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Beginning Balance - Contract Assets Ending Balance - Contract Assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Included in Payable 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 Noncurrent Payables To Affiliates Gross receipts Utilities Operating Expense, Taxes Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Asset retirement obligations Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code 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. Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Income Taxes Income Tax Disclosure [Text Block] Long-term debt assumed by buyer Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Average shares of common stock outstanding and Earnings per average common share Weighted Average Number of Shares Outstanding, Basic [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Related Party [Domain] Related Party [Domain] Basis spread Debt Instrument, Basis Spread on Variable Rate Regulatory Matters Public Utilities Disclosure [Text Block] 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 Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Asset retirement obligations Asset Retirement Obligations, Noncurrent Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Credit Facility [Axis] Credit Facility [Axis] Entity Address, Address Line One Entity Address, Address Line One Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Proprietary trading Proprietary Trading Liabilities [Member] Proprietary Trading Liabilities [Member] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Entity Shell Company Entity Shell Company Schedule of Short-term Debt Schedule of Short-term Debt [Table Text Block] Liquidity Facility Liquidity Facility [Member] Liquidity Facility Total current liabilities Total current liabilities Liabilities, Current Intersegment Revenues Intersegment Eliminations [Member] Solar project entities Solar project entities [Member] Solar project entities Operating revenues Revenue from Contract with Customer, Including Assessed Tax 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. Current Fiscal Year End Date Current Fiscal Year End Date Letters of credit held Derivative, Collateral, Obligation to Return Securities Nonqualified Plan Nonqualified Plan [Member] Community and Minority Facilities Community and Minority Facilities [Member] Community and Minority Facilities Amounts reclassified to receivables Contract with Customer, Asset, Reclassified to Receivable Mutual funds Mutual Fund [Member] Statement [Table] Statement [Table] Unrealized mark-to-market gains (losses) Marketable Securities, Unrealized Gain (Loss) Other Commitments [Axis] Other Commitments [Axis] Non-investment grade External Credit Rating, Non Investment Grade [Member] Total unrecognized compensation costs Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Administrative price cap Public Utilities, Requested Rate Increase (Decrease), Amount Contract with Customer, Liability [Roll Forward] Contract with Customer, Liability [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Not subject to leveling Fair Value Measured at Net Asset Value Per Share [Member] Constellation New England Constellation New England [Member] Represents the New England segment of Constellation Energy Generation. Scenario [Domain] Scenario [Domain] 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] Notes payable to related parties Notes Payable, Related Parties Expected generation hedged in year two Expected Generation Hedged In Year Two The percent for the expected/target percentage of future generation being hedged at an electric generation company in year two. The percentage of expected generation hedged is calculated as the amount of equivalent sales divided by the expected generation. Expected generation represents the amount of energy estimated to be generated or purchased through owned or contracted capacity. Equivalent sales represent all hedging products, which include cash-flow hedges, other derivatives and certain non-derivative contracts including sales to affiliates to serve their retail load. Summary of the Derivative Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Peach Bottom Units 2 and 3 Peach Bottom Units 2 and 3 [Member] Peach Bottom Units 2 and 3 Related Party Transactions Related Party Transactions Disclosure [Text Block] 2022 Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year Pension and Non-Pension Postretirement Benefit Plan Items Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] PHI Pepco Holdings LLC Affiliate [Member] Pepco Holdings LLC Affiliate [Member] Hedging Designation [Domain] Hedging Designation [Domain] 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 U.S. federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Changes in short-term borrowings Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income (loss) attributable to membership interest Net Income (Loss) Attributable to Parent Consideration received or due Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Investments in equities sold short Financial Instruments Sold, Not yet Purchased, Corporate Debt Interest cost Defined Benefit Plan, Interest Cost Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Income Statement Location [Axis] Income Statement Location [Axis] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information. Statistical Measurement [Domain] Statistical Measurement [Domain] Depreciation and amortization Cost, Depreciation and Amortization Purchase price Disposal Group, Including Discontinued Operation, Consideration Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Senior Notes, Due June 2022 Senior Notes, Due June 2022 [Member] Senior Notes, Due June 2022 Decommissioning-related activities: Gain Loss On Nuclear Decommissioning Trust Fund Investments [Abstract] Gain / loss on nuclear decommissioning trust fund investments abstract. Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Restructuring Type [Axis] Restructuring Type [Axis] Letters of credit posted Derivative, Collateral, Right to Reclaim Securities Operating revenues Operating Revenue [Member] This element represents the gains (losses) included in earnings that are recognized in operating revenues. Other Other deferred debits and other assets Other noncurrent assets Other Assets, Noncurrent Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Healthcare cost trend on covered charges Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Segments [Axis] Segments [Axis] 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. Retirement Benefits [Abstract] Retirement Benefits [Abstract] Loss on sale of receivables Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale 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] Entity File Number Entity File Number Nonrecourse Nonrecourse Debt Nonrecourse [Member] DPL Delmarva Power and Light Co Affiliate [Member] Delmarva Power and Light Co Affiliate [Member] Proceeds from NDT fund sales Proceeds from Sale and Maturity of Other Investments Transaction [Domain] Transaction [Domain] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Other Current Assets Other Current Assets [Member] ERCOT Constellation ERCOT [Member] Liability Class [Axis] Liability Class [Axis] Weighted average grant date fair value (in shares) 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 of Derivatives with Credit- Risk Related Contingent Features Fair Value of Derivatives with Credit- Risk Related Contingent Features [Table Text Block] Fair Value of Derivatives with Credit- Risk Related Contingent Features [Table Text Block] [Table Text Block] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] State and municipal debt US States and Political Subdivisions Debt Securities [Member] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Cash equivalents Cash Equivalents [Member] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Debt Instrument [Axis] Debt Instrument [Axis] 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] Reclassification, Type [Domain] Reclassification, Type [Domain] Accretion expense ARO accretion Asset Retirement Obligation, Accretion Expense Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Maturity Less than 30 Days Maturity Less than 30 Days [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Separation from Parent Separation from Parent [Member] Separation from Parent Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Related Party [Axis] Related Party [Axis] Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Secured debt Secured Debt [Member] 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). Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Midwest Constellation Midwest [Member] Represents the Midwest segment of Exelon Corporation and Exelon Generation Company, LLC. Estimated liabilities for asbestos-related bodily injury claims Liability for Asbestos and Environmental Claims, Gross Actual Available Capacity Line of Credit Facility, Remaining Borrowing Capacity Other Other Affiliate [Member] Other Related Party Affiliate Pre-tax gain on disposition Gain (Loss) on Disposition of Business Number of claims Loss Contingency, Pending Claims, Number U.S. Treasury and agencies US Treasury and Government [Member] Public Utility [Axis] Public Utility [Axis] Net realized and unrealized losses (gains) on NDT funds Realized and Unrealized Gain (Loss) on Investments Realized and Unrealized Gain (Loss) on Investments Life insurance contracts 6311 Life Insurance [Member] Consummation of separation Adjustments, Consummation of Separation Adjustments, Consummation of Separation Matching contributions to savings plan Defined Contribution Plan, Cost Due from affiliate Due from Related Parties Net fair value changes related to derivatives Total Unrealized Gain (Loss) on Derivatives Variation margin Margin Deposit Assets Equity Investment VIEs Equity Investment VIE [Member] Equity Investment VIE [Member] Shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Plus: Current period provision for expected credit losses Allowance for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Total Consolidated Operating Revenues Constellation Total Consolidated Group [Member] This member is equivalent to Exelon Generation Co LLC in most cases for segment reporting except for intersegment activity.The consolidated group for intersegment activity represents activity between the segments within the Generation consolidated group as opposed to the activity between Generation and the Exelon consolidated group. Amount Long-term Debt, Gross Payable related to Regulatory Agreement Units Payable to Regulatory Agreement Units, Noncurrent Payable to Regulatory Agreement Units, Noncurrent Total assets Assets, Fair Value Disclosure Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Production tax credits and other credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Total liabilities and equity Total liabilities and equity Liabilities and Equity Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Assets, Total Assets, Total [Member] Increase in DPP Supplemental Deferred Purchase Price Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Derivative [Line Items] Derivative [Line Items] Net increase due to changes in, and timing of, estimated future cash flows Asset Retirement Obligation, Period Increase (Decrease) Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Operating expenses Operating Expenses [Abstract] Equity ownership Equity Method Investment, Ownership Percentage 2026 Other Commitment, to be Paid, Year Five 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Minimum Minimum [Member] Contribution from Exelon Proceeds from Contributions from Affiliates Contracts with customers Contracts with Customers [Member] Contracts with Customers [Member] Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Change in Contract with Customer [Roll Forward] Change in Contract with Customer, Asset [Abstract] To Support Additional Commercial Paper Available Capacity Line of Credit Facility, Capacity Available for Trade Purchases Syndicated credit facility Facility Draws Long-term Line of Credit Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Amortization of investment tax credit, including deferred taxes on basis differences Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Percent Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Percent Total net assets (liabilities) Fair Value, Net Asset (Liability) ERCOT ERCOT [Member] ERCOT Purchases and Sales of Accounts Receivable Purchases and Sales of Accounts Receivable [Table Text Block] Purchases and Sales of Accounts Receivable Market Participant [Domain] Market Participant [Domain] Market Participant [Domain] Deferred debits and other assets Other Assets, Noncurrent [Abstract] Deferred income taxes and unamortized investment tax credits Deferred Income Taxes and Other Tax Liabilities, Noncurrent Commitments And Contingencies [Table] Commitments And Contingencies [Table] Foreign Currency Items Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Debt and Credit Agreements Debt Disclosure [Text Block] Stock-Based Compensation Plans Share-based Payment Arrangement [Text Block] Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Number of reportable segments Number of Reportable Segments Outstanding Letters of Credit Letters of Credit Outstanding, Amount Total other income and (deductions) Nonoperating Income (Expense) Inventories, net Inventories, net Inventory, Net [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance Shares Performance Shares [Member] OPEB Other Postretirement Benefits Plan [Member] Contractual offset Asset Retirement Obligation Contractual Offset Asset Retirement Obligation Contractual Offset Commitments and contingencies Commitments and Contingencies Total noncurrent assets Assets, Noncurrent Increase in PP&E related to ARO update Costs Incurred, Asset Retirement Obligation Incurred Supplemental Balance Sheet Information Supplemental Balance Sheet Information [Table Text Block] Supplemental Balance Sheet Information Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Total Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Restricted Stock Restricted Stock [Member] Receivables [Abstract] Retirement Plan Tax Status [Domain] Retirement Plan Tax Status [Domain] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Cover [Abstract] Receivables from affiliates: Due from Related Parties, 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. Total operating expenses Costs and Expenses OCI before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 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] Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Pledged Status [Axis] Pledged Status [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. Cash Cash Receivables from affiliates Accounts Receivable, Related Parties, Current Realized gains (losses) Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Short-term Debt [Line Items] Short-term Debt [Line Items] Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Document Information [Table] Document Information [Table] Carrying Amount Reported Value Measurement [Member] Payable for tax liabilities upon separation Due to Affiliate Bilateral Credit Agreements Bilateral Credit Agreements [Member] Bilateral Credit Agreements Common Stock Common Stock [Member] Operating income (loss) Operating Income (Loss) Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Hedging Designation [Axis] Hedging Designation [Axis] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Property, plant, and equipment Depreciation Credit Collateral Credit Collateral [Member] Credit collateral associated with counterparty exposure. 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] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Solar Business Solar Business [Member] Solar Business Actuarial loss reclassified to periodic benefit cost Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Non-service costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-service Costs Continental Wind Nonrecourse Debt Continetal Wind [Member] Debt issued for the funding of the ContinentalWindProject Notational amount Derivative, Notional Amount 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. Capital expenditures Payments to Acquire Property, Plant, and Equipment Other Other current liabilities Other Liabilities, Current Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Total mark-to-market derivative net assets (liabilities) Derivative, Fair Value, Net Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Annual qualified pension contribution Defined Benefit Plan, Plan Assets, Contributions by Employer PECO PECO Energy Co Affiliate [Member] Peco Energy Co Related Party Affiliate Income Taxes [Table] Income Taxes [Table] Total liabilities Total liabilities Total liabilities Liabilities Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] 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 Revenues recognized Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Mark-to-Market Derivatives Derivative [Member] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Consolidation Items [Axis] Consolidation Items [Axis] Renewable energy credit obligation Energy Marketing Accounts Payable 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 Recourse Status [Axis] Recourse Status [Axis] Distributions to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Entity Address, City or Town Entity Address, City or Town Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Capitalized costs Related Party Transaction Capitalized Costs Support Services Capitalized costs incurred for support services. Early Plant Retirements Implications Of Potential Early Retirement Disclosure [Text Block] implications of potential early retirement disclosure [Text Block] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Changes in Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Schedule of Short-term Debt Schedule of Short-term Debt [Table] Cash collections received on DPP and reinvested in the Facility Cash Flows Between Transferor and Transferee, Beneficial Interest Mark-to-market derivative assets Mark-to-market derivative assets (noncurrent assets) Derivative Asset, Noncurrent Measurement Frequency [Domain] Measurement Frequency [Domain] Option  Model Option Model Valuation Technique [Member] Option model approach valuation technique used to measure fair value. Interest expense, net Interest Expense Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Average Interest Rate on Commercial Paper Borrowings as of Short-term Debt, Weighted Average Interest Rate, at Point in Time 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. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Nonqualified Plan and Other Postretirement Benefits Plans Nonqualified Plan and Other Postretirement Benefits Plans [Member] Nonqualified Plan and Other Postretirement Benefits Plans Operating and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year One Undistributed earnings Retained Earnings (Accumulated Deficit) ARO beginning balance ARO ending balance Asset Retirement Obligation Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Accounts Receivable, Allowance for Credit Loss [Line Items] Accounts Receivable, Allowance for Credit Loss [Line Items] Line Items for Accounts Receivable, Allowance for Credit Loss [Table] MW of generation Capacity Of Facility Of Company Owned Solar Distribution Generation Facilities Capacity of facility of company owned solar distribution generation facilities. Economic Hedges (Commodity Price Risk) Derivative Instruments, Gain (Loss) [Table Text Block] Fair Value Estimate of Fair Value Measurement [Member] Nuclear Decommissioning Asset Retirement Obligation Disclosure [Text Block] Supplemental Cash Flow Information [Table] Supplemental Cash Flow Information [Table] Schedule disclosing additional information about a registrants statement of cash flows 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] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Amendment Flag Amendment Flag Issuance of long-term debt Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 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. 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] Environmental loss contingencies Accrual for Environmental Loss Contingencies, Component Amount Unrealized gain on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Investments without determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Operating and maintenance from affiliates Related Party Costs, Operating and Maintenance Related Party Costs, Operating and Maintenance Long-term incentive plan activity (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 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. Implications of Potential Early Plant Retirements [Abstract] Implications of Potential Early Plant Retirements [Abstract] Implications of Potential Early Plant Retirements [Abstract] Statement [Line Items] Statement [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Additional collateral required in the event of a credit downgrade below investment grade 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. External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Total Exposure Before Credit Collateral Fair Value, Concentration of Risk, Maximum Amount of Loss [Member] Repayments of short-term borrowings with maturities greater than 90 days Proceeds from (Repayments of) Short-term Debt, Maturing in More than Three Months Net derivative assets Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Long-term incentive plan activity Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Purchased power and fuel from affiliates Related Party Transaction, Purchases from Related Party Retirement Plan Type [Domain] Retirement Plan Type [Domain] Proceeds from sales of assets and businesses Proceeds from Sale of Property Held-for-sale Pension and non-pension postretirement benefit contributions Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Debt Disclosure [Abstract] Debt Disclosure [Abstract] Current portion of ARO Asset Retirement Obligation, Current 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 Corporate, Non-Segment Corporate, Non-Segment [Member] Payables to affiliates Accounts Payable, Related Parties, Current 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 Customer [Axis] Customer [Axis] Retirement Benefits Retirement Benefits [Text Block] Asset Class [Axis] Asset Class [Axis] Forecast Forecast [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Pension and non-pension postretirement benefit plans valuation adjustment Other Comprehensive Income (Loss), Tax Total assets Total assets Total assets Assets Plan Name [Domain] Plan Name [Domain] CEG Parent Parent Company [Member] Other Power Regions  Constellation Other Regions [Member] Interest expense to affiliates Related Party Transaction, Interest Expense Related Party Transaction, Interest Expense Noncontrolling Interests Noncontrolling Interest [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Nine Mile Point Nine Mile Point [Member] Nine Mile Point [Member] 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. Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Performance period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period Senior Notes, Due March 2022 Senior Notes, Due March 2022 [Member] Senior Notes, Due March 2022 Remaining performance obligations, timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Separation related adjustments Adjustments to Additional Paid in Capital, Separation From Parent Adjustments to Additional Paid in Capital, Separation From Parent Outstanding commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Short-term borrowings Short term loan agreement Short-term Debt Net cash flows provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Other accounts receivable (net of allowance for credit losses of $5 as of March 31, 2022 and December 31, 2021) Other Other Receivables, Net, Current Total deferred debits and other assets Total deferred debits and other assets Deferred Costs and Other Assets 2027 and beyond Other Commitment, to be Paid, after Year Five Diluted (in dollars per share) Earnings Per Share, Diluted Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Segments [Domain] Segments [Domain] Service cost Defined Benefit Plan, Service Cost Latty Avenue Latty Avenue [Member] Latty Avenue Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Predecessor Member's Equity(a) Predecessor Member's Equity [Member] Predecessor Member's Equity Comprehensive income (loss) attributable to membership interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Beginning Balance - Contract Liabilities Ending Balance - Contract Liabilities Contract with Customer, Liability Antelope Valley DOE Antelope Valley Antelope Valley [Member] Antelope Valley is a wholly owned indirect subsidiary of EGR IV Other comprehensive income, net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Costs incurred related to decommissioning plants Asset Retirement Obligation, Cash Paid to Settle Mark-to-market derivatives—Economic hedges Derivative Asset, Fair Value, Amount Not Offset Against Collateral Other Noncurrent Liabilities Other Noncurrent Liabilities [Member] 2025 Other Commitment, to be Paid, Year Four Mark-to-market derivative liabilities Mark-to-market derivative liabilities (noncurrent liabilities) Derivative Liability, Noncurrent Benefit payments Payments for Postemployment Benefits Natural gas, oil, and emission allowances Energy Related Inventory, Natural Gas in Storage Gain on sales of assets and businesses Gain (Loss) on Disposition of Other Assets Corporate debt Corporate Debt Securities [Member] Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Total Competitive Businesses Electric Revenues Constellation Reportable Segments Total [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Accounts payable Accounts Payable, Current Net decrease due to an increase in discount rates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Asset impairments Impairment, Long-Lived Asset, Held-for-Use Term Loan Term Loan [Member] Term Loan 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] Common stock dividends Dividends, Common Stock Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Total after-tax stock-based compensation expense Share-based Payment Arrangement, Expense, after Tax Competitive Businesses Natural Gas Revenues  Constellation Natural Gas [Member] Generation Natural Gas [Member] Accumulated Other Comprehensive Loss, net AOCI Attributable to Parent [Member] Inventories Increase (Decrease) in Inventories Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Common stock, shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Investments Long-term Investments ACE Atlantic City Electric Co Affiliate [Member] Atlantic City Electric Co Affiliate [Member] Exelon Corporate Exelon Corporate [Member] Exelon Corporate Cash proceeds received Proceeds from Divestiture of Businesses Accounts receivable Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Entity Central Index Key Entity Central Index Key Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Changes in money pool with Exelon Increase (Decrease) in Due to Affiliates Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Reclassification, Type [Axis] Reclassification, Type [Axis] Proprietary trading Proprietary Trading [Member] Energy-related derivative contracts entered into purely to profit from market prices changes as opposed to hedging an exposure. Number of counterparties Number of Counterparties Represents number of counterparties with a concentrated credit risk greater than 10% of net exposure. Collateral received, net Increase (Decrease) Cash Collateral from Counterparties 2027 through 2031 Defined Benefit Plan, Expected Future Benefit Payment, after Year Four for Next Five Years Defined Benefit Plan, Expected Future Benefit Payment, after Year Four for Next Five Years Other Other noncurrent liabilities Other Liabilities, Noncurrent Pension obligations Pension obligations Defined Benefit Plan, Benefit Obligation Lender Name [Axis] Lender Name [Axis] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Accounts Payable Accounts Payable [Member] Total mark-to-market derivative assets Derivative asset Derivative Asset Credit facility agreements with minority and community banks Line of Credit Facility, Current Borrowing Capacity Energy Efficiency Project Financing Energy Efficiency Project Financing [Member] Energy Efficiency Project Financing 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 Long-term debt Long-term Debt, Excluding Current Maturities Total stock-based compensation expense included in operating and maintenance expense Share-based Payment Arrangement, Expense Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Restricted cash Restricted cash [Member] Restricted cash [Member] Cash collections reinvested in the Facility Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers Purchases, sales, issuances and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest NDT fund investments subtotal 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. Unamortized energy contract assets, noncurrent Energy Marketing Contracts Assets, Noncurrent 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 BGE Baltimore Gas And Electric Company Affiliate [Member] Baltimore Gas and Electric Related Party Affiliate 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. Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Beginning Balance Ending Balance Total equity Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Current assets Assets, Current [Abstract] Other financing activities Proceeds from (Payments for) Other Financing Activities Internally rated — investment grade Internal Investment Grade [Member] 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. Cash equivalents, fair value disclosure Cash and Cash Equivalents, Fair Value Disclosure Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] 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 Other comprehensive income, net of income taxes Other comprehensive income, net of income taxes Other Comprehensive Income (Loss), Net of Tax Fair Value, Recurring Fair Value, Recurring [Member] Requisite service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Allowance for other credit losses Allowance for Credit Loss, Receivable, Other, Current Less: Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Private equity Private Equity Funds [Member] Losses on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Measurement Basis [Axis] Measurement Basis [Axis] Member’s equity Members' Equity [Abstract] Deferred credits and other liabilities Other Liabilities, Noncurrent [Abstract] Expected 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 Other income and (deductions) Nonoperating Income (Expense) [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). Net cash flows provided by investing activities Net Cash Provided by (Used in) Investing Activities LTIP Long Term Incentive Plan [Member] Long Term Incentive Plan [Member] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Total notational amounts Derivative Asset, Notional Amount Wind project entities Wind project entities [Member] Wind project entities Supplemental Statement of Operations Information Supplemental Statement of Operations Information [Table Text Block] Supplemental Statement of Operations Information Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] Other Commitments Other Commitments [Table Text Block] Accelerated depreciation Restructuring and Related Cost, Accelerated Depreciation New York Constellation New York [Member] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Credit facility Aggregate Bank
Commitment Line of Credit Facility, Maximum Borrowing Capacity Ownership [Domain] Ownership [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Cash, restricted cash, and cash equivalents - Held for Sale Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations Taxes other than income taxes Taxes, Miscellaneous Amortization of energy contract assets and liabilities Amortization of Power Contracts Emission Credits Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Other Other current assets Other Assets, Current 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. 2024 Other Commitment, to be Paid, Year Three Predecessor Member's Equity Membership interest Members' Capital Gross fair value of derivative contracts containing this feature Derivative Liability, Fair Value, Gross Liability 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. Distributions to member Payments of Distributions to Affiliates Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization Total depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net Taxes accrued Accrued Income Taxes, Current Pension Benefits Pension Plan [Member] West Medway II 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. Regulated Operations [Abstract] Regulated Operations [Abstract] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Allowance for Credit Losses Rollforward Accounts Receivable, Allowance for Credit Loss [Table Text Block] Contracts liabilities reclassified as held for sale Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Other non-cash operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Conversion ratio Separation From Parent, Conversion Ratio Separation From Parent, Conversion Ratio