Economic hedges Economic Hedging Instrument Liabilites [Member] Economic Hedging Instrument Liabilites [Member] Distributions to member Payments of Distributions to Affiliates Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Retirement of long-term debt Retirement of long-term debt Amount Repayments of Long-Term Debt Remaining repurchase amount Share Repurchase Program, Remaining Authorized, Amount U.S. federal statutory income tax Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other Other Nonoperating Income Cover [Abstract] Income Taxes [Line Items] Income Taxes [Line Items] Total Purchased power and fuel expenses Revenues, Purchased Power and Fuel Expenses Revenues, Purchased Power and Fuel Expenses Trading Symbol Trading Symbol Equity ownership Equity Method Investment, Ownership Percentage Option premiums received (paid), net Option premiums received (paid), net Increase (Decrease) In Option Premiums Collected Received The net change during the reporting period in option premiums collected and paid. Options reflect the right or obligation to buy or sell an energy-related commodity and are classified in current and long-term mark-to-market derivative assets and liabilities. Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 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] Pledged Status [Domain] Pledged Status [Domain] Non-NEOs Non-NEOs [Member] Accelerated Share Repurchases Accelerated Share Repurchases [Table Text Block] Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Allowance for credit losses Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss, Current Line of Credit Facility [Table] Line of Credit Facility [Table] Net realized and unrealized (gains) losses on equity investments Net realized and unrealized (gains) losses on equity investments Equity Securities, FV-NI, Gain (Loss) Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 2026 Other Commitment, to be Paid, Year Two Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Letters of credit held Letters Of Credit Held Letters of credit held related to credit risk Total deferred debits and other assets Deferred Costs and Other Assets Award Timing Disclosures [Line Items] Daily Simple SOFR Rate Daily Simple SOFR Rate [Member] Daily Simple SOFR Rate Investment, Name [Domain] Investment, Name [Domain] Pension and non-pension postretirement benefit contributions Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Cash collateral Cash Collateral for Borrowed Securities Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Total liabilities measured at fair value Liabilities in an Asset Position, Fair Value Disclosure Liabilities in an Asset Position, Fair Value Disclosure Regulatory offset to NDT fund-related activities Regulatory Offset Nuclear Decommissioning Trust Fund Activity This item represents the contractual elimination of nuclear decommissioning trust fund-related activity, which may include realized income (losses), unrealized income (losses), asset retirement obligation accretion, asset retirement cost amortization, investment income and related income taxes. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Number of claims Loss Contingency, Pending Claims, Number 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] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Inventories, net Inventories, net Inventories, net Inventory, Net [Abstract] Total RNF Revenues, Net of Purchased Power and Fuel Expense Revenues, Net of Purchased Power and Fuel Expense Other Other deferred debits and other assets Other noncurrent assets Other Assets, Noncurrent Pledged Status [Axis] Pledged Status [Axis] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Rabbi trust investments Rabbi Trust Investments [Member] This element represents the assets measured at fair value on a recurring basis related to rabbi trust investments. Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Operating Segments Operating Segments [Member] Net cash flows provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from operating activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Secured debt Secured Debt [Member] Accretion expense ARO accretion Asset Retirement Obligation, Accretion Expense Other, net Other, net [Member] This element represents the gains (losses) included in earnings that recognized in Other, net. Award Timing Method Award Timing Method [Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Plant Type [Domain] Plant Type [Domain] Plant Type [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Variable lease income Operating Lease, Variable Lease Income Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Total Exposure Before Credit Collateral Fair Value, Concentration of Risk, Maximum Amount of Loss [Member] Insider Trading Policies and Procedures [Line Items] Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Total Available Capacity Line of Credit Facility, Capacity Available for Trade Purchases Adjustment to Compensation, Amount Adjustment to Compensation Amount Compensation Amount Outstanding Recovery Compensation Amount PTC Effective Income Tax Rate Reconciliation, Premium Tax Credit, Percent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Transaction Type [Axis] Transaction Type [Axis] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Tabular List, Table Tabular List [Table Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Net fair value changes related to derivatives Net fair value changes related to derivatives Total Unrealized Gain (Loss) on Derivatives Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount 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. Total other non-cash operating activities Other Non-cash Operating Activities Other Non-cash Operating Activities Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] Taxes other than income taxes Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Term SOFR Rate Term SOFR Rate [Member] Term SOFR Rate Goodwill Goodwill Depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net [Abstract] Other comprehensive income (loss), net of income taxes Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Value of stock authorized for repurchase Share Repurchase Program, Authorized, Amount Economic Hedges Economic Hedges [Member] Economic Hedges [Member] Fixed income Fixed Income Securities [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, plant, and equipment Depreciation Total mark-to-market derivative net assets (liabilities) Derivative, Fair Value, Net Other financing activities Other financing activities Proceeds from (Payments for) Other Financing Activities Comprehensive income (loss) attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Taxes accrued Accrued Income Taxes, Current Pension Benefits Pension Plan [Member] Foreign Tax Effects Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Qualified NDT fund income and losses Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Award Type Award Type [Axis] Property, plant, and equipment (net of accumulated depreciation and amortization of $18,377 and $18,088 as of March 31, 2025 and December 31, 2024, respectively) Property, plant, and equipment (net of accumulated depreciation and amortization of $18,377 and $18,088 as of March 31, 2025 and December 31, 2024, respectively) Property, plant, and equipment, net Property, Plant and Equipment, Net 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. Total liabilities Total liabilities Total liabilities Liabilities Noncontrolling interests Equity, Attributable to Noncontrolling Interest Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Other revenues Revenue Not from Contract with Customer Total Shareholder Return Amount Total Shareholder Return Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Membership interest Members' Capital Settlement charges Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Cash Cash [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Nonrecourse Nonrecourse [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Renewable energy credits Renewable energy credits Renewable Energy Credits, Current Renewable Energy Credits, Current NER NER [Member] NER Total shareholders’ equity Equity, Attributable to Parent Effect of netting and allocation of collateral Effects of Netting and Allocation of Collateral [Member] Effects of Netting and Allocation of Collateral [Member] Mark-to-market derivative assets Mark-to-market derivative assets Mark-to-market derivative assets (current) Derivative Asset, Current 2028 Other Commitment, to be Paid, Year Four Outstanding Letters of Credit Letters of Credit Outstanding, Amount Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Collateral Posted [Domain] Collateral Posted [Domain] Collateral Posted [Domain] Proceeds from NDT fund sales Proceeds from NDT fund sales Proceeds from Sale and Maturity of Other Investments Utility Plant [Domain] Utility Plant [Domain] Unrealized gain (loss) on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Assumed exercise and/or distributions of stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Investments in equities Equity Securities [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Changes in equity of noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) ASSETS ASSETS Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Other comprehensive income (loss), net of income taxes Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax Prior service benefit reclassified to periodic benefit cost Prior service benefit reclassified to periodic benefit cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Document Type Document Type Line of credit facility, fee rate Line of Credit Facility, Commitment Fee Percentage Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Nonrelated Party Nonrelated Party [Member] Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization Total depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] CEG Parent Parent Company [Member] Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Accounts payable Accounts Payable, Current Financial Institutions Financial institutions [Member] Financial institutions Sale of Accounts Receivable Sale of Accounts Receivable [Member] Sale of Accounts Receivable Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Name Outstanding Recovery, Individual Name Increase (decrease) in cash, restricted cash, and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Award Timing Predetermined Award Timing Predetermined [Flag] Mark-to-market derivative liabilities subtotal Commodity Derivative Liabilites [Member] Commodity Derivative Liabilites [Member] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Investment, Name [Axis] Investment, Name [Axis] Recourse Status [Axis] Recourse Status [Axis] Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] Prior service (credit) cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Forecast Forecast [Member] Diluted (in dollars per share) Earnings Per Share, Diluted Counterparty Name [Domain] Counterparty Name [Domain] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Ownership [Axis] Ownership [Axis] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Accounts receivable Accounts receivable Increase (Decrease) in Receivables Included in net income (loss) Total (losses) gains included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings BilateralMarch2025 BilateralMarch2025 [Member] BilateralMarch2025 Letters of credit held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Net income (loss) Net income (loss) Net (loss) income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Income tax (benefit) expense Income tax (benefit) expense Income tax (benefit) expense Income Tax Expense (Benefit) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Interest cost Defined Benefit Plan, Interest Cost Other income and (deductions) Other income and (deductions) Nonoperating Income (Expense) [Abstract] Total 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. Notional amount Derivative, Notional Amount Total mark-to-market derivative assets Mark-to-market derivative assets Derivative Asset Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Net Exposure Net Exposure [Member] Net counterparty exposure after application/netting of collateral. Net cash flows provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Proceeds from new transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent All Adjustments to Compensation All Adjustments to Compensation [Member] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] CPS CPS [Member] CPS Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Legal Entity [Axis] Legal Entity [Axis] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Scenario [Domain] Scenario [Domain] Commodity Contract Commodity Contract [Member] Remaining performance obligations, timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Gains (losses) on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Accounts receivable Accounts receivable Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Variable Interest Entities by Interest Type [Domain] Variable Interest Entities by Interest Type [Domain] Commercial Agreement VIEs Commercial Agreement VIE [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] LIABILITIES AND EQUITY LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Costs incurred related to decommissioning plants Asset Retirement Obligation, Cash Paid to Settle Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Mark-to-market derivative assets subtotal Commodity Derivative Assets [Member] Commodity Derivative Assets [Member] Restatement Determination Date Restatement Determination Date Mark-to-Market Derivatives Derivative [Member] Mark-to-market derivatives—Economic hedges Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Fair Value Estimate of Fair Value Measurement [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Cash equivalents Cash Equivalents NDT [Member] Cash Equivalents NDT [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Impaired Long-Lived Asset, Held and Used [Table] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] 2025 Other Commitment, to be Paid, Year One Total liabilities measured at fair value Financial Liabilities Fair Value Disclosure Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] 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. Pension and non-pension postretirement benefit plans Other Comprehensive Income (Loss), Tax Other Other Pension and Other Postretirement Benefits, Non-Material Items Other Pension and Other Postretirement Benefits, Non-Material Items Other Other [Member] Other [Member] PEO PEO [Member] Nuclear Decommissioning Asset Retirement Obligation Disclosure [Text Block] Government Assistance [Line Items] Government Assistance [Line Items] Name Trading Arrangement, Individual Name Mergers, Acquisitions, and Dispositions [Abstract] Mergers, Acquisitions, and Dispositions Other Commitments Other Commitments [Table Text Block] Other Other Labor-related Expenses 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] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Open Claims Open Claims [Member] Open Claims Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Increase (decrease) in DPP Increase (decrease) in DPP Supplemental Deferred Purchase Price Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Cash equivalents, fair value disclosure Cash and Cash Equivalents, Fair Value Disclosure Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number 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 Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Unamortized energy contract assets, noncurrent Energy Marketing Contracts Assets, Noncurrent Changes in assets and liabilities: Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount 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] Gross fair value of derivative contracts containing this feature Derivative Liability, Subject to Master Netting Arrangement, before Offset Newly issued shares (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Number of share repurchase agreements Number of Share Repurchase Agreements Number of Share Repurchase Agreements Cash proceeds received upon sale Proceeds from Sale of DPP Proceeds from Sale of DPP Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Debt Disclosure [Abstract] Debt Disclosure [Abstract] 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. Common Stock Common Stock [Member] Constellation Energy Generation, LLC Constellation Energy Generation, LLC [Member] Constellation Energy Generation, LLC [Member] Cash collateral posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Collection of DPP, net Collection of DPP, net Proceeds from Collection of Retained Interest in Securitized Receivables Tax Exempt Pollution Control Revenue Bonds Pollution Control Revenue Bonds [Member] Pollution Control Revenue Bonds Total member’s equity Members' Equity Segment Reporting [Abstract] Segment Reporting [Abstract] Collateral Collateral [Member] Collateral [Member] Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] STP Nuclear Operating Company STP Nuclear Operating Company [Member] STP Nuclear Operating Company Foreign Currency Items Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Cash collateral received Cash Collateral Received Cash collateral received related to credit risk. Accounts payable and accrued expenses Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Total assets measured at fair value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Actuarial loss reclassified to periodic benefit cost Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [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. AEP Texas AEP Texas, Inc. [Member] AEP Texas, Inc. Measurement Basis [Axis] Measurement Basis [Axis] Energy cooperatives and municipalities Energy cooperatives and municipalities [Member] Energy cooperatives and municipalities Title Trading Arrangement, Individual Title Claim Type [Axis] Claim Type [Axis] Claim Type Deferred income taxes and unamortized ITCs Deferred income taxes and unamortized ITCs Deferred Income Taxes and Other Tax Liabilities, Noncurrent Consolidated Entities [Axis] Consolidated Entities [Axis] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest City Area Code City Area Code Current liabilities Current liabilities Liabilities, Current [Abstract] Other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Change in short-term borrowings Change in short-term borrowings Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Variable Interest Entities by Interest Type [Axis] Variable Interest Entities by Interest Type [Axis] EGRP CRP [Member] CRP[Member] Economic hedges Economic Hedging Instrument [Member] Economic Hedging Instrument [Member] Outstanding Commercial Paper Line of Credit Facility, Remaining Borrowing Capacity Repurchases of common stock Payments for Repurchase of Common Stock Document Information [Line Items] Document Information [Line Items] CenterPoint CenterPoint Energy Houston Electric, LLC [Member] CenterPoint Energy Houston Electric, LLC Long-term debt Long-term debt Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Letters of credit Financial Standby Letter of Credit [Member] Netting Netting [Member] Netting [Member] Earnings per average common share Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] Equities NDT Equity Securities Nuclear Decommissioning Trust Fund [Member] Equity Securities Nuclear Decommissioning Trust Fund Related Party, Name [Axis] Related Party, Name [Axis] Related Party, Name Retained earnings (deficit) Undistributed earnings (deficit) Retained Earnings (Accumulated Deficit) Investor-owned utilities, marketers, power producers Investor-owned utilities, marketers, power producers [Member] Investor-owned utilities, marketers, power producers Inventories Inventories Increase (Decrease) in Inventories Net realized and unrealized gains (losses) from equity investments Equity Securities, FV-NI, Unrealized Gain (Loss) Deferred income taxes and amortization of ITCs Deferred income taxes and amortization of ITCs Deferred Income Taxes and Tax Credits External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Unamortized Energy Contracts Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] Underlying Securities Award Underlying Securities Amount Deferred compensation obligation Deferred Compensation Liability, Current and Noncurrent Realized gains (losses) Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Purchases, sales, issuances and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Amendment Flag Amendment Flag Carrying Amount Reported Value Measurement [Member] Unrealized mark-to-market gains (losses) Marketable Security, Unrealized Gain (Loss) Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] 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. OCI before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Debt and Credit Agreements Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Mark-to-market derivative liabilities Mark-to-market derivative liabilities Mark-to-market derivative liabilities (noncurrent) Derivative Liability, Noncurrent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Interest Rate Swap Interest Rate Swap [Member] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Other investing activities Other investing activities Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Increase (decrease) in capital expenditures not paid Increase (decrease) in capital expenditures not paid Change in Capital Expenditures Incurred But Not Yet Paid The non cash impact of change in capital expenditures incurred but not yet paid. Nuclear PTCs Nuclear PTCs [Member] Nuclear PTCs Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [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). PTC Effective Income Tax Rate Reconciliation, Premium Tax Credit, Amount Effective Income Tax Rate Reconciliation, Premium Tax Credit, Amount Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule of Short-term Debt Short-Term Debt [Table] Disclosure of Credit Derivatives Disclosure of Credit Derivatives [Table Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total assets Total assets Total assets Assets Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] 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 Capital expenditures Capital expenditures Payments to Acquire Property, Plant, and Equipment Other Other Other noncurrent liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Commitments and contingencies (Note 13) Commitments and contingencies (Note 13) Commitments and Contingencies Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Asset retirement obligations Asset retirement obligations Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Asset Retirement Obligations Excluding Spent Nuclear Fuel, Noncurrent Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] 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] 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. Payable for tax liabilities upon separation Other Liabilities Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Cash collateral held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Net decrease due to changes in, and timing of, estimated future cash flows Asset Retirement Obligation, Period Increase (Decrease) Net income (loss) attributable to common shareholders Net Loss Attributable to Parent Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Fair Value of Financial Liabilities Recorded at Amortized Cost Fair Value, by Balance Sheet Grouping [Table Text Block] Total long-term debt issued (redeemed) Proceeds From (Payments For) Long-Term Debt Proceeds From (Payments For) Long-Term Debt Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Recourse Status [Domain] Recourse Status [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] BilateralJan2025 BilateralJan2025 [Member] BilateralJan2025 Entity File Number Entity File Number Consolidated Entities [Domain] Consolidated Entities [Domain] Noncontrolling Interests Noncontrolling Interests Noncontrolling Interest [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Liquidity Facility Liquidity Facility [Member] Liquidity Facility Common stock dividends Dividends, Common Stock Average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Name Forgone Recovery, Individual Name Transaction [Domain] Transaction [Domain] Other non-cash operating activities Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] 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. Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Volatility percentage Derivative Asset (Liability) Net, Measurement Input Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Public Utility [Axis] Public Utility [Axis] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Natural gas, oil, and emission allowances Natural gas, oil, and emission allowances Energy Related Inventory, Natural Gas in Storage Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Document Quarterly Report Document Quarterly Report Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Accumulated other comprehensive income (loss), net Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Collateral Posted [Axis] Collateral Posted [Axis] Collateral Posted Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Document Information [Table] Document Information [Table] Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest 2027 Other Commitment, to be Paid, Year Three Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Filer Category Entity Filer Category Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Calpine Calpine [Member] Calpine Mark-to-market derivative assets Mark-to-market derivative assets Mark-to-market derivative assets (noncurrent) Derivative Asset, Noncurrent Letters of credit posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Statistical Measurement [Domain] Statistical Measurement [Domain] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information. Other Other Other current liabilities Other Liabilities, Current Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Decommissioning-related activities: Gain Loss On Nuclear Decommissioning Trust Fund Investments [Abstract] Gain / loss on nuclear decommissioning trust fund investments abstract. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Derivative [Line Items] Derivative [Line Items] Operating revenues Operating Revenue [Member] This element represents the gains (losses) included in earnings that are recognized in operating revenues. Government assistance, operating income, increase (decrease) Government Assistance, Operating Income, Increase (Decrease) Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 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. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Derivative [Table] Derivative [Table] 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] Operating and maintenance Operating and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Summary of the Derivative Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Other assets and liabilities Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Other Performance Measure, Amount Other Performance Measure, Amount Estimate Government Assistance, Revenue Estimate Government Assistance, Revenue Estimate Common stock, shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Property Real Estate Tax Expense Other accounts receivable (net of allowance for credit losses of $6 as of March 31, 2025 and December 31, 2024) Other accounts receivable (net of allowance for credit losses of $6 as of March 31, 2025 and December 31, 2024) Other accounts receivable, net Other Receivables, Net, Current Purchased power and fuel Purchased power and fuel Cost, Direct Material Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] ERCOT Constellation ERCOT [Member] Total noncurrent assets Assets, Noncurrent Product and Service, Other Product and Service, Other [Member] Service cost Defined Benefit Plan, Service Cost Constellation South Texas LLP Constellation South Texas LLP [Member] Constellation South Texas LLP Entity Tax Identification Number Entity Tax Identification Number Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] 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] Offsetting fair value of contracts under master netting arrangements Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Retirement Plan Type [Axis] Retirement Plan Type [Axis] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Total AOCI Including Portion Attributable to Noncontrolling Interest [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] Asset retirement obligations Asset Retirement Obligations, Noncurrent Equity Components [Axis] Equity Components [Axis] Other Other Other current assets Other Assets, Current 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] Derivative asset notational amounts Derivative Asset, Notional Amount Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value DPP reclassified Retained Interest, Fair Value Disclosure, Reclassified Amount Retained Interest, Fair Value Disclosure, Reclassified Amount Total operating expenses Costs and Expenses Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Separation from Parent Separation from Parent [Member] Separation from Parent Capped call option contracts Equity-Classified Written Call Option, Modification, Equity Issuance, Increase (Decrease) in Equity, Amount Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Common stock repurchased Common stock repurchased Stock Repurchased During Period, Value Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other Liabilities Other Liabilities [Member] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Retail Electric Supplier Platform Retail Electric Supplier Platform [Member] Retail Electric Supplier Platform Asset Pledged as Collateral Asset Pledged as Collateral [Member] 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). 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 Midwest Constellation Midwest [Member] Represents the Midwest segment of Exelon Corporation and Exelon Generation Company, LLC. Actuarial loss reclassified to periodic cost Actuarial loss reclassified to periodic cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Current assets Current assets Assets, Current [Abstract] Internally rated — investment grade Internal Investment Grade [Member] Consolidation Items [Axis] Consolidation Items [Axis] Average Arithmetic Average [Member] Net realized and unrealized (gains) losses on NDT funds Net realized and unrealized (gains) losses on NDT funds Realized and Unrealized Gain (Loss) on Investments Realized and Unrealized Gain (Loss) on Investments Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Discounted Cash Flow Valuation, Income Approach [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) Equity Investment VIEs Equity Investment VIE [Member] Equity Investment VIE [Member] Materials and supplies Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Security Exchange Name Security Exchange Name Basis spread Debt Instrument, Basis Spread on Variable Rate Payroll Cost, Direct Labor Payables related to Regulatory Agreement Units Payables related to Regulatory Agreement Units Payable to Regulatory Agreement Units, Noncurrent Payable to Regulatory Agreement Units, Noncurrent Excess officers compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Officers Compensation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Officers Compensation, Percent Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Total Other Commitment Purchasers Purchasers [Member] Purchasers Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Income taxes Income taxes Increase (Decrease) in Income Taxes Payable Entity [Domain] Entity [Domain] Credit facility Aggregate Bank Commitment Line of Credit Facility, Maximum Borrowing Capacity Pension and non-pension postretirement benefit plan valuation adjustment Pension and non-pension postretirement benefit plan valuation adjustment Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, after Tax Real Estate Funds Real Estate Funds [Member] Total mark-to-market derivative liabilities Mark-to-market derivative liabilities Derivative Liability Other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Payables related to Regulatory Agreement Units Accounts Payable and Accrued Liabilities, Noncurrent Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Acquisitions of assets and businesses Acquisitions of assets and businesses Payments to Acquire Businesses, Net of Cash Acquired Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] 2029 Other Commitment, to be Paid, Year Five Cash Flow Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Related Party Related Party [Member] Actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Amortization of ITC, 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 Hedging Designation [Domain] Hedging Designation [Domain] Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Interest expense, net Interest expense, net Interest Expense, Nonoperating Pension and non-pension postretirement benefit costs Pension and Other Postretirement Benefits Cost (Reversal of Cost) Less: Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Fair Value, Recurring Fair Value, Recurring [Member] Customer accounts receivable (net of allowance for credit losses of $194 and $190 as of March 31, 2025 and December 31, 2024, respectively) Customer accounts receivable (net of allowance for credit losses of $194 and $190 as of March 31, 2025 and December 31, 2024, respectively) Customer accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Purchases and Sales of Accounts Receivable Purchases and Sales of Accounts Receivable [Table Text Block] Purchases and Sales of Accounts Receivable Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Mergers, Acquisitions, and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Shares received, percentage of agreement cost Accelerated Share Repurchase, Shares Received, Percentage of Agreement Cost Accelerated Share Repurchase, Shares Received, Percentage of Agreement Cost Commercial Paper Commercial Paper [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Amortization of intangible assets, net Amortization of Intangible Assets Supplemental Balance Sheet Information Supplemental Balance Sheet Information [Table Text Block] Supplemental Balance Sheet Information Accounting Policies [Abstract] Accounting Policies [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Amortization of ITC, including deferred taxes on basis differences Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Amount Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Amount PEO Name PEO Name All Award Types Award Type [Domain] Government Assistance Government Assistance [Text Block] 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. Employee incentive plan (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Estimated Future Claims Estimated Future Claims [Member] Estimated Future Claims Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Membership Interest Membership Interest [Member] An ownership interest in a limited liability company. Pension and non-pension postretirement benefit obligations Pension and non-pension postretirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Non-PEO NEO Non-PEO NEO [Member] Investments, fair value disclosure Investments, Fair Value Disclosure Private credit Private Credit Private Credit [Member] Private Credit [Member] Deferred Costs and Other Assets Deferred Costs and Other Assets [Member] Deferred Costs and Other Assets Hedging Relationship [Axis] Hedging Relationship [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. Retirement Benefits Retirement Benefits [Text Block] Short-term Debt [Line Items] Short-Term Debt [Line Items] Qualified NDT fund income and losses Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Total equity Beginning Balance Ending Balance Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Government Assistance, Type [Axis] Government Assistance, Type [Axis] Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Bilateral Credit Agreements Bilateral Credit Agreements [Member] Bilateral Credit Agreements Assets measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Pension and OPEB Items Pension and OPEB plans valuation adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Member’s equity Members' Equity [Abstract] Interest Rate Debt Instrument, Interest Rate, Stated Percentage Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Supplemental cash flow information Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Credit Collateral Credit Collateral [Member] Credit collateral associated with counterparty exposure. Economic Hedges (Commodity Price Risk) Derivative Instruments, Gain (Loss) [Table Text Block] Total other income and (deductions) Nonoperating Income (Expense) 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] Claim Type [Domain] Claim Type [Domain] Claim Type [Domain] Effective income tax Effective Income Tax Rate Reconciliation, Percent Operating income (loss) Operating Income (Loss) Variable Rate [Domain] Variable Rate [Domain] Non-service components of pension benefits & OPEB (credit) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-Service Costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Non-Service Costs Antelope Valley DOE Nonrecourse Debt Antelope Valley DOE Loan [Member] Antelope Valley DOE Loan Continental Wind Nonrecourse Debt Continental Wind [Member] Debt issued for the funding of the ContinentalWindProject Number of reportable segments Number of Reportable Segments Total liabilities and equity Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Designation [Axis] Hedging Designation [Axis] 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. Mark-to-market derivative liabilities Mark-to-market derivative liabilities Mark-to-market derivative liabilities (current) Derivative Liability, Current Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] PECO PECO Energy Co Affiliate [Member] Peco Energy Co Related Party Affiliate Long-term debt due within one year Long-term debt due within one year Long-Term Debt and Lease Obligation, Current Income Taxes [Table] Income Taxes [Table] Industry of Counterparty [Domain] Industry of Counterparty [Domain] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Individual: Individual [Axis] Accumulated Other Comprehensive Income (Loss), net Accumulated Other Comprehensive Income (Loss), net AOCI Attributable to Parent [Member] Outstanding debt assumed Business Combination, Consideration Transferred, Liabilities Incurred Product and Service [Axis] Product and Service [Axis] Statement [Line Items] Statement [Line Items] Operating expenses Operating expenses Operating Expenses [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Consideration Business Combination, Consideration Transferred Deferred debits and other assets Deferred debits and other assets Other Assets, Noncurrent [Abstract] Minimum Minimum [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] Internally rated — non-investment grade Internal Noninvestment Grade [Member] Option Model Option Model Valuation Technique [Member] Option model approach valuation technique used to measure fair value. Adoption Date Trading Arrangement Adoption Date Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Collateral received (posted), net Collateral received (posted), net Increase (Decrease) Cash Collateral from Counterparties 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. Investment grade External Credit Rating, Investment Grade [Member] Total deferred credits and other liabilities Deferred Credits and Other Liabilities Government Assistance [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Plus: Current period provision for expected credit losses Accounts Receivable, Credit Loss Expense (Reversal) Natural Gas, Geothermal, Battery Storage, and Solar Assets Natural Gas, Geothermal, Battery Storage, and Solar Assets [Member] Natural Gas, Geothermal, Battery Storage, and Solar Assets Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] U.S. federal statutory income tax Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Estimated nuclear PTCs credits used Government Assistance, Liability, Decrease Exercise Price Award Exercise Price Arrangement Duration Trading Arrangement Duration Supplemental Cash Flow Information [Table] Supplemental Cash Flow Information [Table] Schedule disclosing additional information about a registrants statement of cash flows Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Shareholders' equity Equity Equity, Attributable to Parent [Abstract] Investments Investments Long-Term Investments Estimated refunds recognized Government Assistance, Liability Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Proceeds from short-term borrowings with maturities greater than 90 days Proceeds from short-term borrowings with maturities greater than 90 days Proceeds from Short-Term Debt, Maturing in More than Three Months All Individuals All Individuals [Member] Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Maximum exposure Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure 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. Variable Rate [Axis] Variable Rate [Axis] Cash collections received on DPP and reinvested in the Facility Cash Flows Between Transferor and Transferee, Beneficial Interest Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Long-Term Debt, including amounts due within one year Debt Instrument, Fair Value Disclosure Other, net Other, net Total Other, net Other Nonoperating Income (Expense) OPEB Other Postretirement Benefits Plan [Member] Noncontrolling interests Members' Equity Attributable to Noncontrolling Interest Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Receivables [Abstract] Accounts Receivable Facility Accounts Receivable Facility [Member] Accounts Receivable Facility Par value (in dollars per share) Business Acquisition, Equity Interest Issued or Issuable, Par Value Business Acquisition, Equity Interest Issued or Issuable, Par Value Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] 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] Other Commitments [Domain] Other Commitments [Domain] Unamortized energy contract assets, current Energy Marketing Contracts Assets, Current Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Capital Allocation Plan Capital Allocation Plan [Member] Capital Allocation Plan Spent nuclear fuel obligation Spent nuclear fuel obligation SNF Obligation Spent Nuclear Fuel Obligation, Noncurrent Related Party [Domain] Related and Nonrelated Parties [Domain] 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. Accounts payable and accrued expenses Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Pension Plan and Other Postretirement Benefits Plan Pension Plan and Other Postretirement Benefits Plan [Member] Pension Plan and Other Postretirement Benefits Plan Depreciation and amortization Depreciation and amortization Cost, Depreciation and Amortization Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1) Incremental Collateral For Loss Of Investment Grade Credit Rating Incremental collateral amount required to be provided related to its financial instruments, including derivatives, non-derivatives, normal purchase normal sales contracts and applicable payables and receivables, if the credit rating is downgraded below investment grade. Liability Class [Axis] Liability Class [Axis] Net fair value of derivative contracts containing this feature Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Common stock repurchased (in shares) Common stock repurchased (in shares) Stock Repurchased During Period, Shares Common stock repurchased, average price (in dollars per share) Stock Repurchased During Period, Average Price Paid Per Share Stock Repurchased During Period, Average Price Paid Per Share Nuclear decommissioning trust funds Nuclear decommissioning trust funds Decommissioning Fund Investments Share Repurchase Program [Domain] Share Repurchase Program [Domain] 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. Renewable energy credit obligation Renewable energy credit obligation Energy Marketing Accounts Payable MW of generation Capacity Of Facility Of Company Owned Generation Facilities Capacity of facility of company owned solar distribution generation facilities. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Measure: Measure [Axis] Asset Class [Domain] Asset Class [Domain] Outstanding commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Entity Emerging Growth Company Entity Emerging Growth Company Other Power Regions Constellation Other Regions [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Reclassification, Type [Domain] Reclassification, Type [Domain] 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. Equity Component [Domain] Equity Component [Domain] Gross receipts Utilities Operating Expense, Taxes Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Other non-cash operating activities Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Statement [Table] Statement [Table] Pension and non-pension postretirement benefit plans: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] Measurement Frequency [Domain] Measurement Frequency [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Consolidation Items [Domain] Consolidation Items [Domain] Estimated liabilities for asbestos-related bodily injury claims Liability for Asbestos and Environmental Claims, Gross RPG Nonrecourse Debt RPG Debt [Member] RPG Debt Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Excess officers compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Officers Compensation, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Officers Compensation, Amount Non-investment grade External Credit Rating, Noninvestment Grade [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Total current assets Total current assets Assets, Current Antelope Valley Antelope Valley [Member] Antelope Valley is a wholly owned indirect subsidiary of EGR IV Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Surety bonds Surety Bond [Member] Total receivables sold Accounts Receivable, Sale Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Commitments [Axis] Other Commitments [Axis] Investments without determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Reclassification, Type [Axis] Reclassification, Type [Axis] Income Taxes Income Tax Disclosure [Text Block] Related Party, Name [Domain] Related Party, Name [Domain] Related Party, Name [Domain] Other Noncurrent Liabilities Other Noncurrent Liabilities [Member] Net cash flows provided by (used in) financing activities Net cash flows provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Credit Facility [Axis] Credit Facility [Axis] Entity Registrant Name Entity Registrant Name Payments to acquire businesses Payments to Acquire Businesses, Gross Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Total net assets Fair Value, Net Asset (Liability) Affiliated Entities Affiliated Entity [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Nuclear fuel Amortization of Nuclear Fuel Unbilled customer revenues Unbilled Contracts Receivable Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Employee incentive plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Net Restatement Determination Date: Restatement Determination Date [Axis] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Title of 12(b) Security Title of 12(b) Security Common stock (No par value, 1,000 shares authorized, 313 shares outstanding as of March 31, 2025 and December 31, 2024) Common Stock, Value, Issued Deferred credits and other liabilities Deferred credits and other liabilities Other Liabilities, Noncurrent [Abstract] ARO beginning balance ARO ending balance Asset Retirement Obligation State income taxes, net of federal income tax benefit(a) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Estimated nuclear PTC receivable Government Assistance, Asset Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Cash flows from financing activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Basic (in dollars per share) Earnings Per Share, Basic Cash and Cash Equivalents Cash and Cash Equivalents [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Restricted cash Restricted cash [Member] Restricted cash [Member] Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Cash collections reinvested in the Facility Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers Ownership [Domain] Ownership [Domain] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Extended period term Line of Credit Facility, Extended Term Period Line of Credit Facility, Extended Term Period Total current liabilities Liabilities, Current Share Repurchase Program [Axis] Share Repurchase Program [Axis] NDT fund investments subtotal NDT Fund Investments Nuclear Decommissioning Trust Fund Investments [Member] This element represents the assets measured at fair value on a recurring basis related to nuclear decommissioning trust fund investments. Facility Draws Long-Term Line of Credit Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] No Additional Collateral Posted No Additional Collateral Posted [Member] No Additional Collateral Posted 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. Private Equity Funds Private Equity Funds [Member] Operating revenues Operating revenues Total Operating revenues Revenues Assets, Total Assets, Total [Member] Sale of equity ownership Equity Method Investment, Sale, Ownership Percentage Equity Method Investment, Sale, Ownership Percentage Entity Address, City or Town Entity Address, City or Town Issuance of long-term debt Issuance of long-term debt Proceeds from Issuance of Long-Term Debt March 2024 March 2024 ASR Agreement [Member] March 2024 ASR Agreement Plant Type [Axis] Plant Type [Axis] Plant Type Shareholders' Equity Comprehensive Income (Loss) Note [Text Block] Business Acquisition [Axis] Business Acquisition [Axis] 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). Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Government Assistance, Type [Domain] Government Assistance, Type [Domain] Supplemental Statement of Operations Information Supplemental Statement of Operations Information [Table Text Block] Supplemental Statement of Operations Information Receivables from and payables to affiliates, net Increase (Decrease) in Due to Related Parties Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total assets Assets, Fair Value Disclosure Government Assistance [Table] Government Assistance [Table] New York Constellation New York [Member] Document Period End Date Document Period End Date Asset Class [Axis] Asset Class [Axis] Insider Trading Arrangements [Line Items] Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Repayments of short-term borrowings with maturities greater than 90 days Repayments of short-term borrowings with maturities greater than 90 days Repayments of Short-Term Debt, Maturing in More than Three Months Other Current Assets Other Current Assets [Member] Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. City of Austin City of Austin [Member] City of Austin Document Transition Report Document Transition Report ComEd Commonwealth Edison Co Affiliate [Member] Commonwealth Edison Co Affiliate. Investment in NDT funds Investment in NDT funds Payments to Acquire Other Investments Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Comprehensive income (loss), net of income taxes Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings (Deficit) Undistributed Earnings (Deficit) Retained Earnings [Member] Accrued undiscounted amounts Accrual for Environmental Loss Contingencies, Gross 2030 and beyond Other Commitment, to be Paid, after Year Five Distributions to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared West Medway II Nonrecourse Debt 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. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Allowance for other credit losses Allowance for Credit Loss, Receivable, Other, Current Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Amortization of energy contract assets and liabilities Amortization of Power Contracts Emission Credits Letter of credit Letter of Credit [Member] Foreign Tax Effects Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent Company Selected Measure Name Company Selected Measure Name