Consideration Proceeds from Divestiture of Businesses Government Assistance Government Assistance [Text Block] Schedule of Short-Term Debt Schedule of Short-Term Debt [Table Text Block] Commodity Contract Commodity Contract [Member] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Net decrease due to changes in, and timing of, estimated future cash flows Asset Retirement Obligation, Period Increase (Decrease) Effect of netting and allocation of collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Equity investments with readily determinable fair values Equity Investments with Readily Determinable Fair Values [Member] Equity Investments with Readily Determinable Fair Values Income Taxes [Line Items] Income Taxes [Line Items] Tabular List, Table Tabular List [Table Text Block] Pension and non-pension postretirement benefit plans Other Comprehensive Income (Loss), Tax 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. GPC First-Lien Senior Secured Term Loan Facility Geysers Power Company GPC First-Lien Senior Secured Term Loan Facility [Member] GPC First-Lien Senior Secured Term Loan Facility Fair Value of Financial Liabilities Recorded at Amortized Cost Fair Value, by Balance Sheet Grouping [Table Text Block] Maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted 2028 Other Commitment, to be Paid, Year Two Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Government Assistance [Table] Government Assistance [Table] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Regulatory Matters Public Utilities Disclosure [Text Block] 2031 and thereafter Other Commitment, to be Paid, After Year Four Other Commitment, to be Paid, After Year Four Offsetting fair value of derivative contracts under master netting arrangements Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Pin Oak Creek Energy Center Pin Oak Creek Energy Center Credit Agreement [Member] Pin Oak Creek Energy Center Credit Agreement Letters of credit held Letters Of Credit Held Letters of credit held related to credit risk Daily Simple SOFR Rate Daily Simple SOFR Rate [Member] Daily Simple SOFR Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Benefits Pension Plan [Member] Change in short-term borrowings Change in short-term borrowings Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Derivative asset notational amounts Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] 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. Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] 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 Total shareholders’ equity Equity, Attributable to Parent Other comprehensive income (loss), net of income taxes Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Total RNF Revenues, Net of Purchased Power and Fuel Expense Revenues, Net of Purchased Power and Fuel Expense Property, Plant, and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Surety bonds Surety Bond [Member] Unamortized energy contracts(b) Business Combination, Recognized Asset Acquired, Unamortized Energy Credits Business Combination, Recognized Asset Acquired, Unamortized Energy Credits 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. Pension and non-pension postretirement benefit plans: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract] Reclassification, Type [Domain] Reclassification, Type [Domain] Term Loan Due September 2026 Term Loan Due September 2026 [Member] Term Loan Due September 2026 LIABILITIES AND EQUITY LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] 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. Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Other, net Other, net [Member] This element represents the gains (losses) included in earnings that recognized in Other, net. Cash collateral Cash Collateral for Borrowed Securities Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Plant Type [Domain] Plant Type [Domain] Plant Type [Domain] Internally rated — investment grade Internal Investment Grade [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounts payable and accrued expenses Business Combination, Recognized Liability Assumed, Accounts Payable and Accrued Liabilities Business Combination, Recognized Liability Assumed, Accounts Payable and Accrued Liabilities Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Other deferred debits and other assets Business Combination, Recognized Asset Acquired, Unamortized Energy Contracts, Noncurrent Business Combination, Recognized Asset Acquired, Unamortized Energy Contracts, Noncurrent Entity Shell Company Entity Shell Company PTC tax credits Effective Income Tax Rate Reconciliation, Premium Tax Credit, Percent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Issuance Proceeds from Issuance of Debt CDHI Revolver CDHI Revolver [Member] CDHI Revolver Realized gains (losses) Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Recourse Status [Domain] Recourse Status [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Assets held for sale Total assets held for sale Business Combination, Recognized Asset Acquired, Asset Held for Sale Business Combination, Recognized Asset Acquired, Asset Held for Sale Cash Flow Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] 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 Letter of credit Letter of Credit [Member] 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] Document Fiscal Period Focus Document Fiscal Period Focus Property Real Estate Tax Expense Award Timing Method Award Timing Method [Text Block] Term SOFR Rate Term SOFR Rate [Member] Term SOFR Rate NYISO NYISO [Member] NYISO Award Type Award Type [Axis] Foreign Currency Items Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] CEG Parent Parent Company [Member] Utility Plant [Domain] Utility Plant [Domain] Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Debt Instrument Redemption and Issuance Debt Instrument Redemption And Issuance [Table Text Block] Debt Instrument Redemption And Issuance Economic Hedges Economic Hedges [Member] Economic Hedges [Member] Employee incentive plan (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] 2029 Senior Unsecured Notes 2029 Senior Notes [Member] 2029 Senior Notes Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total merger consideration Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company Cash collateral posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset 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] Number of natural gas powered plants Number of Natural Gas Powered Plants Number of Natural Gas Powered Plants 2029 Other Commitment, to be Paid, Year Three 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. Distributions to member Payments of Distributions to Affiliates Common stock, shares outstanding (in shares) Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Capacity Revenues Capacity Revenues [Member] Capacity Revenues Gain (loss) on sales of assets Gain (loss) on sales of assets Gain (Loss) on Disposition of Other Assets Current period provision for expected credit losses Accounts Receivable, Credit Loss Expense (Reversal) 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 Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Total Power revenues Power Revenue [Member] Power Revenue Additional Third Uncommitted Bilateral Facility Additional Third Uncommitted Bilateral Facility [Member] Additional Third Uncommitted Bilateral Facility Inventories Business Combination, Recognized Asset Acquired, Asset Held for Sale, Inventory Business Combination, Recognized Asset Acquired, Asset Held for Sale, Inventory Total net assets Fair Value, Net Asset (Liability) Renewable energy credits Business Combination, Recognized Asset Acquired, Renewable Energy Credits Business Combination, Recognized Asset Acquired, Renewable Energy Credits Taxes accrued Accrued Income Taxes, Current 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] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax (benefit) expense Income tax (benefit) expense Effective income tax Income Tax Expense (Benefit) Basis spread Debt Instrument, Basis Spread on Variable Rate Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Document Information [Line Items] Document Information [Line Items] Derivative liabilities Business Combination, Recognized Liability Assumed, Derivative Liability Business Combination, Recognized Liability Assumed, Derivative Liability Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] DOE Loan Program DOE Loan Program [Member] DOE Loan Program Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Other deferred credits and other liabilities Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts, Noncurrent Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts, Noncurrent Unrealized gain (loss) on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Total property, plant, and equipment Property, Plant and Equipment, Gross Renewable energy credits Renewable energy credits Renewable Energy Credits, Current Renewable Energy Credits, Current NER NER [Member] NER Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Notes payable and other Notes Payable, Other Payables [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Mergers, Acquisitions, and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Acquisition of Calpine, net of cash and restricted cash acquired Acquisition of Calpine, net of cash and restricted cash acquired Cash consideration Payments to Acquire Businesses, Net of Cash Acquired Other Other Nonoperating Income Payroll Cost, Direct Labor All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] 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] Asset retirement obligations Business Combination, Recognized Liability Assumed, Asset Retirement Obligations Excluding Spent Nuclear Fuel Business Combination, Recognized Liability Assumed, Asset Retirement Obligations Excluding Spent Nuclear Fuel Class of Treasury Stock [Table] Class of Treasury Stock [Table] Qualified NDT fund income and losses Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Collateral Posted [Domain] Collateral Posted [Domain] Collateral Posted [Domain] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash flows provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Subsequent Event Subsequent Event [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount PP&E Depreciation Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Gross fair value of derivative contracts containing this feature Derivative Liability, Subject to Master Netting Arrangement, before Offset Assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 2027 Other Commitment, to be Paid, Year One Deferred income taxes and unamortized ITCs Business Combination, Recognized Liability Assumed, Deferred Income Taxes and Other Tax Liabilities Business Combination, Recognized Liability Assumed, Deferred Income Taxes and Other Tax Liabilities Number of reportable segments Number of Reportable Segments Unamortized debt discount and premium, net Debt Instrument, Unamortized Discount (Premium), Net Derivative assets Business Combination, Recognized Asset Acquired, Derivative Asset Business Combination, Recognized Asset Acquired, Derivative Asset Fair Value, Concentration of Risk, Disclosure Items [Domain] Fair Value, Concentration of Risk, Disclosure Items [Domain] Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Entity Address, State or Province Entity Address, State or Province 2028 Floating Rate Senior Notes 2028 Floating Rate Senior Notes [Member] 2028 Floating Rate Senior Notes Common stock dividends Dividends, Common Stock Financial Institutions Financial institutions [Member] Financial institutions Total current liabilities Liabilities, Current Individual: Individual [Axis] Amortization of acquired derivative contracts Amortization of Acquired Derivatives Amortization of Acquired Derivatives Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Retirement of long-term debt Retirement of long-term debt Repayments of debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Government Assistance, Type [Axis] Government Assistance, Type [Axis] LS Power LS Power [Member] LS Power Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount 2030 Other Commitment, to be Paid, Year Four 2066 Senior Notes 2066 Senior Notes [Member] 2066 Senior Notes Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-term debt due within one year Long-term debt due within one year Long-Term Debt and Lease Obligation, Current Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Ownership [Domain] Ownership [Domain] Various Non-recourse Debt and Project Financing Arrangements Various Non-recourse Debt and Project Financing Arrangements [Member] Various Non-recourse Debt and Project Financing Arrangements Other Other deferred debits and other assets Other noncurrent assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key 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. PEO Name PEO Name ARO beginning balance ARO ending balance Asset Retirement Obligation Operating revenues Operating revenues Operating revenues Total Operating revenues Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Calpine Development Holdings Calpine Development Holdings [Member] Calpine Development Holdings Net Exposure Net Exposure [Member] Net counterparty exposure after application/netting of collateral. CDHI Revolver, Renewable Energy Project Construction CDHI Revolver, Renewable Energy Project Construction [Member] CDHI Revolver, Renewable Energy Project Construction Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Forward power price (Congestion) Fair Value Inputs Forward Power Price Assets, Congestion Fair Value Inputs Forward Power Price Assets, Congestion Summary of the Derivative Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Contracts acquired at acquisition date Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Acquisition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Acquisition Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Business Combination, Recognized Asset Acquired to Liability Assumed, Held for Sale [Abstract] Business Combination, Recognized Asset Acquired to Liability Assumed, Held for Sale [Abstract] Business Combination, Recognized Asset Acquired to Liability Assumed, Held for Sale U.S. federal statutory income tax Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Industry of Counterparty [Domain] Industry of Counterparty [Domain] Long-term debt Long-term debt Long-Term Debt, Excluding Current Maturities Guarantee under the Calpine AR Facility Guarantee of Indebtedness of Others [Member] Nonrelated Party Nonrelated Party [Member] Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] 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] Entity Address, Address Line One Entity Address, Address Line One Restricted cash and cash equivalents Business Combination, Recognized Asset Acquired, Restricted Cash and Cash Equivalent Business Combination, Recognized Asset Acquired, Restricted Cash and Cash Equivalent Accumulated Other Comprehensive Income (Loss), net Accumulated Other Comprehensive Income (Loss), net AOCI Attributable to Parent [Member] Allowance for credit losses Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss, Current Investments [Domain] Investments [Domain] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Common stock issued for acquisition of Calpine Acquisition of Calpine Stock Issued Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] Ownership [Axis] Ownership [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Proceeds from NDT fund sales Proceeds from NDT fund sales Proceeds from Sale and Maturity of Other Investments Prior service (credit) cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Variable Interest Entities by Interest Type [Domain] Variable Interest Entities by Interest Type [Domain] 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 Liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Commercial Agreement VIEs Commercial Agreement VIE [Member] Power and Power-related Revenues Power and Power-related Revenues [Member] Power and Power-related Revenues Term Loan Due May 2026 Term Loan Due May 2026 [Member] Term Loan Due May 2026 Decrease in PP&E related to ARO update Property Plant and Equipment, Period Increase (Decrease) Related to Asset Retirement Obligation Adjustment Property Plant and Equipment, Period Increase (Decrease) Related to Asset Retirement Obligation Adjustment Deferred compensation obligation Deferred Compensation Liability, Current and Noncurrent Total assets measured at fair value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Costs incurred related to decommissioning plants Costs incurred related to decommissioning plants Asset Retirement Obligation, Cash Paid to Settle Assumed exercise and/or distributions of stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Total operating expenses Costs and Expenses Deferred income taxes and unamortized ITCs Deferred income taxes and unamortized ITCs Deferred Income Taxes and Other Tax Liabilities, Noncurrent Document Quarterly Report Document Quarterly Report Deferred income taxes and amortization of ITCs Deferred income taxes and amortization of ITCs Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Investment Type [Axis] Investment Type [Axis] Total Investments Increase in facility Line of Credit Facility, Increase (Decrease), Net Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount First-Priority Lien, Power and Natural Gas Agreements First-Priority Lien, Power and Natural Gas Agreements [Member] First-Priority Lien, Power and Natural Gas Agreements Payments to acquire businesses Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Outstanding Letters of Credit Letters of Credit Outstanding, Amount Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] All Award Types Award Type [Domain] Energy Contracts Energy Contracts [Member] Energy Contracts Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other non-cash operating activities Other Noncash Income (Expense) Total deferred credits and other liabilities Deferred Credits and Other Liabilities Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount 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. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Other Other Pension and Other Postretirement Benefits, Non-Material Items Other Pension and Other Postretirement Benefits, Non-Material Items Other Other [Member] Other [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Outstanding receivables offset Government Assistance, Asset, Decrease Asset retirement obligations Business Combination, Recognized Liability Acquired, Asset Held for Sale, Asset Retirement Obligations Excluding Spent Nuclear Fuel Business Combination, Recognized Liability Acquired, Asset Held for Sale, Asset Retirement Obligations Excluding Spent Nuclear Fuel Retirement Plan Type [Domain] Retirement Plan Type [Domain] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Economic hedges Mark-to-market derivatives—Economic hedges Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Other Other Labor-related Expenses Mergers, Acquisitions, and Dispositions [Abstract] Mergers, Acquisitions, and Dispositions Accumulated other comprehensive income (loss), net Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Depreciation, amortization, and accretion Depreciation, Amortization and Accretion, Net [Abstract] Financial Instruments [Domain] Financial Instruments [Domain] Calpine Calpine Segment [Member] Calpine Segment 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] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] 2029 Unsecured Notes 2029 Unsecured Notes [Member] 2029 Unsecured Notes Total Available Capacity Line of Credit Facility, Capacity Available for Trade Purchases Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Inventories, net Inventories, net Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Other amortization Amortization of Other Deferred Charges Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name 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 Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net income(a) Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Debt and Credit Agreements Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Estimated nuclear PTC receivable Government Assistance, Asset Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total Purchased power and fuel expenses Purchased Power and Fuel Expenses Purchased Power and Fuel Expenses Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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] Deferred debits and other assets Deferred debits and other assets Other Assets, Noncurrent [Abstract] Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Number of share repurchase agreements Number of Share Repurchase Agreements Number of Share Repurchase Agreements Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Business Combination, Unamortized Energy Credits [Abstract] Business Combination, Unamortized Energy Credits [Abstract] Business Combination, Unamortized Energy Credits 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. Debt, current Business Combination, Recognized Liability Assumed, Long-Term Debt, Current Entity Small Business Entity Small Business Other current liabilities Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts, Current Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts, Current Constellation Energy Generation, LLC Constellation Energy Generation, LLC [Member] Constellation Energy Generation, LLC [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Estimated refunds recognized Government Assistance, Liability Document Transition Report Document Transition Report Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Underlying Securities Award Underlying Securities Amount Collateral Collateral [Member] Collateral [Member] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Income Taxes Income Tax Disclosure [Text Block] Proceeds from Lines of Credit Proceeds from Lines of Credit Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Cash collateral received Cash Collateral Received Cash collateral received related to credit risk. Emissions Emissions [Member] Emissions Discounted Cash Flow Valuation, Income Approach [Member] Accrued litigation, noncurrent Estimated Litigation Liability, Noncurrent Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name 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. Product and Service [Axis] Product and Service [Axis] AEP Texas AEP Texas, Inc. [Member] AEP Texas, Inc. Energy cooperatives and municipalities Energy cooperatives and municipalities [Member] Energy cooperatives and municipalities Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Cash collections received on DPP and reinvested in the Facility Cash Flows Between Transferor and Transferee, Beneficial Interest Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Variable lease income Operating Lease, Variable Lease Income Accounts receivable, net Other Receivables, Net, Current Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Variable Interest Entities by Interest Type [Axis] Variable Interest Entities by Interest Type [Axis] EGRP CRP [Member] CRP[Member] Letters of credit Financial Standby Letter of Credit [Member] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Current liabilities Current liabilities Liabilities, Current [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Economic Hedges (Commodity Price Risk) Derivative Instruments, Gain (Loss) [Table Text Block] CenterPoint CenterPoint Energy Houston Electric, LLC [Member] CenterPoint Energy Houston Electric, LLC Level 1 Fair Value, Inputs, Level 1 [Member] Facility Draws Long-Term Line of Credit Netting Netting [Member] Netting [Member] Diluted (in dollars per share) Earnings Per Share, Diluted Other tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Equities Equity Securities Nuclear Decommissioning Trust Fund [Member] Equity Securities Nuclear Decommissioning Trust Fund Tax-exempt notes Tax Exempt Notes [Member] Tax Exempt Notes Related Party, Name [Axis] Related Party, Name [Axis] Related Party, Name Number of existing uncommitted bilateral facilities Number of Existing Uncommitted Bilateral Facilities Number of Existing Uncommitted Bilateral Facilities Nuclear fuel Nuclear Fuel [Member] Nonnuclear Decommissioning Asset Retirement Obligation [Member] Nonnuclear Decommissioning Asset Retirement Obligation [Member] Investor-owned utilities, marketers, power producers Investor-owned utilities, marketers, power producers [Member] Investor-owned utilities, marketers, power producers Consolidation Items [Domain] Consolidation Items [Domain] Unamortized Energy Contracts Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Government Assistance [Abstract] 2031 Unsecured Notes 2031 Unsecured Notes [Member] 2031 Unsecured Notes Vesting period Business Combination, Consideration Transferred, Equity Interest, Estimated Fair Value Subject to Vesting, Period Business Combination, Consideration Transferred, Equity Interest, Estimated Fair Value Subject to Vesting, Period Disclosure of Credit Derivatives Disclosure of Credit Derivatives [Table Text Block] 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. Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Total long-term debt Long-Term Debt, Gross Property, Plant, and Equipment Property, Plant and Equipment Disclosure [Text Block] Trade Names Trade Names [Member] Expiration Date Trading Arrangement Expiration Date Other Commitments [Domain] Other Commitments [Domain] Recourse Status [Axis] Recourse Status [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] Net realized and unrealized gains (losses) from equity investments Equity Securities, FV-NI, Unrealized Gain (Loss) Fixed income Fixed Income Securities [Member] Property, plant, and equipment (net of accumulated depreciation and amortization of $19,524 and $19,072, respectively) Property, plant, and equipment (net of accumulated depreciation and amortization of $19,524 and $19,072, respectively) Property, plant, and equipment, net Property, plant, and equipment, net Property, Plant and Equipment, Net Nuclear PTCs Nuclear PTCs [Member] Nuclear PTCs Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Other assets Business Combination, Recognized Asset Acquired, Asset Held for Sale, Other Assets Business Combination, Recognized Asset Acquired, Asset Held for Sale, Other Assets Entity Current Reporting Status Entity Current Reporting Status 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 tax credits Effective Income Tax Rate Reconciliation, Premium Tax Credit, Amount Effective Income Tax Rate Reconciliation, Premium Tax Credit, Amount Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] U.S. federal statutory income tax Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Derivative liabilities subtotal Derivative Liability, Subject to Master Netting Arrangement, after Offset Financial Instrument [Axis] Financial Instrument [Axis] Other non-cash operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Asset retirement obligations Asset Retirement Obligations, Noncurrent Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Issuance of long-term debt Issuance of long-term debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Included in Payables related to Regulatory Agreement Units Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Gain (Loss) Included In Noncurrent Payables To Affiliates Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Gain (Loss) Included In Noncurrent Payables To Affiliates Accounts, Notes, Loans and Financing Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Total derivative liabilities Derivative Liability Cash Cash [Member] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] 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 Proceeds from new transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Property, plant and equipment Business Combination, Recognized Asset Acquired, Asset Held for Sale, Property, Plant and Equipment Business Combination, Recognized Asset Acquired, Asset Held for Sale, Property, Plant and Equipment 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] Corporate Debt Corporate Debt [Member] Corporate Debt Common stock issued to acquire Calpine Acquisition of Calpine Stock Issued During Period, Value, Acquisitions 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. Net identifiable assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Membership interest Members' Capital Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Accounts payable and accrued expenses Accounts payable and accrued expenses Total Accounts Payable and Accrued Liabilities, Current CWIP Assets CWIP Assets [Member] CWIP Assets SNF Obligation Spent Nuclear Fuel Obligation, Noncurrent Net cash flows provided by (used in) financing activities Net cash flows provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Investment grade External Credit Rating, Investment Grade [Member] Measure: Measure [Axis] Senior Secured First Lien Notes Senior Secured First Lien Notes [Member] Senior Secured First Lien Notes Total long-term debt issued (redeemed) Proceeds From (Payments For) Long-Term Debt Proceeds From (Payments For) Long-Term Debt Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Total derivative net assets (liabilities) Derivative, Fair Value, Net Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Operating and maintenance Operating and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Remaining repurchase amount Share Repurchase Program, Remaining Authorized, Amount Actuarial loss reclassified to periodic benefit cost Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Common Stock, Shares Issued, Not Disclosed Common Stock, Shares Issued, Not Disclosed Common Stock, Shares Issued, Not Disclosed Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Derivative assets subtotal Derivative Asset, Subject to Master Netting Arrangement, after Offset Liquidity Facility Liquidity Facility [Member] Liquidity Facility Entity Tax Identification Number Entity Tax Identification Number Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Derivatives Derivative [Member] Accrued undiscounted amounts Accrual for Environmental Loss Contingencies, Gross Interest expense, net Interest expense, net Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Derivative assets Derivative assets Derivative assets (current) Derivative Asset, Current Income taxes Income taxes Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount Amortization of acquired contracts Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Acquisition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Acquisition Security Exchange Name Security Exchange Name Fixed rates Non Recourse Fixed Rate Member [Member] Non Recourse Fixed Rate Member [Member] Unrealized mark-to-market gains (losses) Marketable Security, Unrealized Gain (Loss) Maximum borrowing capacity Aggregate Bank Commitment Line of Credit Facility, Maximum Borrowing Capacity Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract] Collateral Posted [Axis] Collateral Posted [Axis] Collateral Posted Common stock repurchased (in shares) Stock Repurchased During Period, Shares Other Credit Facility Other Credit Facility [Member] Other Credit Facility Revenue Type [Axis] Revenue Type [Axis] Revenue Type Operating expenses Operating expenses Operating Expenses [Abstract] Other Other Other current liabilities Other Liabilities, Current Asset Class [Domain] Asset Class [Domain] 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 Pension and non-pension postretirement benefit obligations Pension and non-pension postretirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Reclassification, Type [Axis] Reclassification, Type [Axis] Statement [Line Items] Statement [Line Items] Repayments of short-term borrowings with maturities greater than 90 days Repayments of short-term borrowings with maturities greater than 90 days Repayments of Short-Term Debt, Maturing in More than Three Months Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Common Stock Common Stock [Member] Calpine Calpine [Member] Calpine Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Other Revenues Other Revenue Type [Member] Other Revenue Type Total receivables sold Accounts Receivable, Sale Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Property, plant, and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 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 Aggregate commitments available including incremental commitments Line of Credit Facility, Maximum Borrowing Capacity, Including Incremental Commitments Line of Credit Facility, Maximum Borrowing Capacity, Including Incremental Commitments Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Asset Class [Axis] Asset Class [Axis] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest Rate Swap Interest Rate Swap [Member] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information. Equity in income (losses) of unconsolidated affiliates Equity in income (losses) of unconsolidated affiliates Income (Loss) from Equity Method Investments Unbilled customer revenues Unbilled Contracts Receivable Newly issued shares (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Unamortized energy contract assets, current Energy Marketing Contracts Assets, Current Decommissioning-related activities: Gain Loss On Nuclear Decommissioning Trust Fund Investments [Abstract] Gain / loss on nuclear decommissioning trust fund investments abstract. Pledged Status [Axis] Pledged Status [Axis] Operating revenues Operating Revenue [Member] This element represents the gains (losses) included in earnings that are recognized in operating revenues. Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic (in dollars per share) Earnings Per Share, Basic Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Accounts payable and accrued expenses Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities 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. 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] Other comprehensive income (loss), net of income taxes Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax Inventories, net Inventory Disclosure [Abstract] Estimated fair value of common stock subject to vesting period attributable to post-combination expense Business Combination, Consideration Transferred, Equity Interest, Estimated Fair Value Subject to Vesting Business Combination, Consideration Transferred, Equity Interest, Estimated Fair Value Subject to Vesting Short-term borrowings Short-Term Debt Variable rates Non Recourse Variable Rate [Member] Non Recourse Variable Rate [Member] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Nova Power Credit Agreement Nova Power Nova Power Credit Agreement [Member] Nova Power Credit Agreement Affiliated Entities Affiliated Entity [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) Schedule of Impaired Long-Lived Assets Held and Used [Table] Impaired Long-Lived Asset, Held and Used [Table] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Real Estate Funds Real Estate Funds [Member] Cash and Cash Equivalents Cash and Cash Equivalents [Member] ERCOT Constellation ERCOT [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Hedging Designation [Domain] Hedging Designation [Domain] Current assets Current assets Assets, Current [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] 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] Total liabilities and equity Liabilities and Equity Pension and OPEB Items Pension and OPEB plans valuation adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Common stock issued to acquire Calpine (in shares) Stock Issued During Period, Shares, Acquisitions Letters of credit held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Accounting Policies [Abstract] Accounting Policies [Abstract] Public Utility [Axis] Public Utility [Axis] International Power International [Member] International Investment in NDT funds Investment in NDT funds Payments to Acquire Other Investments Government assistance, operating income, increase (decrease) Government Assistance, Operating Income, Increase (Decrease) Pay vs Performance Disclosure [Line Items] Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Total liabilities measured at fair value Financial Liabilities Fair Value Disclosure Separation from Parent Separation from Parent [Member] Separation from Parent Other Other Other deferred credits and other liabilities Other Liabilities, Noncurrent Unamortized fair value of debt Unamortized Fair Value of Debt Unamortized Fair Value of Debt 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] Revenue Type [Domain] Revenue Type [Domain] Revenue Type [Domain] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Long-term debt due within one year Long-Term Debt, Current Maturities Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Comprehensive income (loss) attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Retail Electric Supplier Platform Retail Electric Supplier Platform [Member] Retail Electric Supplier Platform Definitive agreement period Business Combination, Definitive Agreement Period Business Combination, Definitive Agreement Period 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). Secured Debt Project Finance Secured Debt [Member] Midwest Constellation Midwest [Member] Represents the Midwest segment of Exelon Corporation and Exelon Generation Company, LLC. Unsecured Debt Unsecured Debt [Member] Effect of netting and allocation of collateral Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Loan agreement Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Total assets Total assets Assets MISO MISO [Member] MISO Geographical [Domain] Geographical [Domain] Net realized and unrealized (gains) losses on NDT funds Net realized and unrealized (gains) losses on NDT funds Realized and Unrealized Gain (Loss) on Investments Realized and Unrealized Gain (Loss) on Investments External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Cash flows from operating activities Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Member’s equity Members' Equity [Abstract] Weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Equity Investment VIEs Equity Investment VIE [Member] Equity Investment VIE Private Equity Funds Private Equity Funds [Member] Renewable energy credit obligation Business Combination, Recognized Liability Assumed, Energy Marketing Accounts Payable Business Combination, Recognized Liability Assumed, Energy Marketing Accounts Payable Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Other investments: Other Investments Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Pension and non-pension postretirement benefit contributions Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits Total assets acquired Business Combination, Recognized Asset Acquired, Asset Level 2 Fair Value, Inputs, Level 2 [Member] State income taxes, net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Payables related to Regulatory Agreement Units Payables related to Regulatory Agreement Units Payable to Regulatory Agreement Units, Noncurrent Payable to Regulatory Agreement Units, Noncurrent Amortization of UECs Amortization of Power Contracts Emission Credits Equity method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] 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 Related Party Related Party [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Volatility percentage Derivative Asset (Liability) Net, Measurement Input Calpine Term Loan B-5 Calpine Term Loan B-5 [Member] Calpine Term Loan B-5 Document Information [Table] Document Information [Table] PEO PEO [Member] 2026 Other Commitment, to be Paid, Remainder of Fiscal Year Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Number of generation assets to be sold Number of Generation Assets to be Sold Number of Generation Assets to be Sold Total deferred debits and other assets Deferred Costs and Other Assets Total Exposure Before Credit Collateral Fair Value, Concentration of Risk, Maximum Amount of Loss [Member] Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Changes in assets and liabilities: Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Retained Earnings (Deficit) Undistributed Earnings (Deficit) Retained Earnings [Member] 2031 Senior Unsecured Notes 2031 Senior Notes due February [Member] 2031 Senior Notes due February 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 Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Total derivative assets Derivative Asset Noncontrolling interests Members' Equity Attributable to Noncontrolling Interest Unamortized energy contract assets, noncurrent Energy Marketing Contracts Assets, Noncurrent SERC/SPP SERC/SPP [Member] SERC/SPP Not Designated as Hedging Instrument, Economic Hedge Not Designated as Hedging Instrument, Economic Hedge [Member] Newly issued shares, lock-up period (percentage) Business Acquisition, Consideration Transferred, Equity Interest, Share Issued, Lock-up Period, Percentage Business Acquisition, Consideration Transferred, Equity Interest, Share Issued, Lock-up Period, Percentage Derivative liabilities Derivative liabilities Derivative liabilities (noncurrent) Derivative Liability, Noncurrent Product and Service [Domain] Product and Service [Domain] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Net income (loss) Net income (loss) Net (loss) income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Business Combination [Table] Business Combination [Table] Notional amount Derivative, Notional Amount Acquisition of Calpine Asset Retirement Obligation, Liabilities Incurred Purchased power and fuel Purchased power and fuel Cost, Direct Material Purchase Price Allocation Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Amortization of ITC, including deferred taxes on basis differences tax credits Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Percent Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Percent City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] 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 Greenfield L.P. Loan Facility Greenfield Greenfield L.P. Loan Facility [Member] Greenfield L.P. Loan Facility Cash flows from investing activities Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Changes in equity of noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) Actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Investments in equities Equity Securities, FV-NI Natural Gas Natural Gas [Member] Payable for tax liabilities upon separation Other Liabilities Goodwill Goodwill Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Payables related to Regulatory Agreement Units Accounts Payable and Accrued Liabilities, Noncurrent Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Deferred credits and other liabilities Deferred credits and other liabilities Other Liabilities, Noncurrent [Abstract] 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 Supplemental disclosure of non-cash investing and financing activities Supplemental disclosure of non-cash investing and financing activities Supplemental Cash Flow Information [Abstract] Accounts receivable Business Combination, Recognized Asset Acquired, Receivable, Current Supplemental Balance Sheet Information Supplemental Balance Sheet Information [Table Text Block] Supplemental Balance Sheet Information Other Performance Measure, Amount Other Performance Measure, Amount Unrealized gain (loss) on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Related Party [Domain] Related and Nonrelated Parties [Domain] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Increase (decrease) in cash, restricted cash, and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Amortization of ITC, including deferred taxes on basis differences tax credits Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Amount Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Amount Foreign tax effects Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent Net realized and unrealized (gains) losses on equity investments Net realized and unrealized (gains) losses on equity investments Equity Securities, FV-NI, Gain (Loss) Derivative Instrument [Axis] Derivative Instrument [Axis] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Decrease in total capacity Debt Instrument, Increase (Decrease), Net Other Other Other current assets Other Assets, Current Investments Investments [Abstract] 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. Entity [Domain] Entity [Domain] Net cash flows provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligations, timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 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] Membership Interest Membership Interest [Member] An ownership interest in a limited liability company. Derivative assets Derivative assets Derivative assets (noncurrent) Derivative Asset, Noncurrent Document Fiscal Year Focus Document Fiscal Year Focus Private Credit Private Credit [Member] Private Credit [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Nonrecourse Nonrecourse [Member] Rabbi trust investments Deferred Compensation Plan Assets Effective income tax Effective Income Tax Rate Reconciliation, Percent 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. Carrying Amount Reported Value Measurement [Member] Collateral received (posted), net Collateral received (posted), net Increase (Decrease) Cash Collateral from Counterparties Taxes other than income taxes Taxes other than income taxes Taxes other than income taxes Taxes, Miscellaneous Equity [Abstract] Equity [Abstract] Segment Information Segment Reporting Disclosure [Text Block] 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] Long-term debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Other Commitments Other Commitments [Table Text Block] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Shareholders' Equity Comprehensive Income (Loss) Note [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangible assets, net Amortization of Intangible Assets Bilaterals Bilateral Credit Agreements [Member] Bilateral Credit Agreements Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted cash and cash equivalents Restricted Cash and Cash Equivalent, Current West West [Member] West Share repurchase Stock Repurchased During Period, Value Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Increase (decrease) in income tax receivable Increase (Decrease) in Income Taxes Receivable 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 Other available for sale debt security investments Other Available for Sale Debt Security Investments [Member] Other Available for Sale Debt Security Investments Credit Collateral Credit Collateral [Member] Credit collateral associated with counterparty exposure. 2031 Senior Secured Notes 2031 Senior Notes due March [Member] 2031 Senior Notes due March Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Segments [Axis] Segments [Axis] Comprehensive income (loss), net of income taxes Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract] Electric Electric Generation Equipment [Member] 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 Local Phone Number Local Phone Number Continental Wind Nonrecourse Debt Continental Wind Nonrecourse Debt [Member] Debt issued for the funding of the ContinentalWindProject Antelope Valley DOE Nonrecourse Debt Antelope Valley DOE Loan [Member] Antelope Valley DOE Loan Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Estimated nuclear PTCs credits used Government Assistance, Liability, Decrease Stock price (in dollars per share) Share Price Other investing activities Other investing activities Payment for (Proceeds from) Other Investing Activity 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. Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent ASSETS ASSETS Assets [Abstract] Increase in stock authorized for repurchase Share Repurchase Program, Increase in Authorized Amount Share Repurchase Program, Increase in Authorized Amount Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Other Commitments [Axis] Other Commitments [Axis] PECO PECO Energy Co Affiliate [Member] Peco Energy Co Related Party Affiliate Debt Instrument [Axis] Debt Instrument [Axis] Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Retirement Benefits Retirement Benefits [Text Block] 2028 Senior Notes 2028 Senior Notes [Member] 2028 Senior Notes Income Taxes [Table] Income Taxes [Table] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Shareholders' equity Equity Equity, Attributable to Parent [Abstract] Derivative liabilities Derivative liabilities Derivative liabilities (current) Derivative Liability, Current Forward power price (Non-congestion) Fair Value Inputs Forward Power Price Assets, Non-Congestion This element represents the forward power market price used to calculate the change in fair value of the derivative instrument. Private credit Private Credit, Nuclear Decommissioning Trust Fund [Member] Private Credit [Member] Investment, Name [Axis] Investment, Name [Axis] Interest Rate Debt Instrument, Interest Rate, Stated Percentage Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Foreign tax effects Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount Depreciation, amortization, and accretion, including nuclear fuel and contract amortization Depreciation, amortization, and accretion, including nuclear fuel and contract amortization Total Depreciation, Amortization and Accretion, Net Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other revenues Other Revenue [Member] Other Revenue Regulated Operations [Abstract] Regulated Operations [Abstract] Total assets Assets, Fair Value Disclosure Option Model Option Model Valuation Technique [Member] Option model approach valuation technique used to measure fair value. Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Investments without determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Energy [Axis] Energy [Axis] 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). Debt Business Combination, Recognized Liability Assumed, Long-Term Debt Business Combination, Recognized Liability Assumed, Long-Term Debt Interest cost Defined Benefit Plan, Interest Cost Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] 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 Repayments of facility Repayments of Long-Term Lines of Credit Other Noncurrent Liabilities Other Noncurrent Liabilities [Member] Restatement Determination Date: Restatement Determination Date [Axis] Total member’s equity Members' Equity Total liabilities associated with assets held for sale Business Combination, Recognized Liability Acquired, Asset Held for Sale Business Combination, Recognized Liability Acquired, Asset Held for Sale Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Contribution from member Noncontrolling Interest, Increase from Subsidiary Equity Issuance Other financing activities Other financing activities Proceeds from (Payment for) Other Financing Activity Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Supplemental Cash Flow Information [Table] Supplemental Cash Flow Information [Table] Schedule disclosing additional information about a registrants statement of cash flows Name Trading Arrangement, Individual Name Schedule of Short-term Debt Short-Term Debt [Table] Issued Amount Debt Instrument, Face Amount Share Repurchase Program [Axis] Share Repurchase Program [Axis] Estimated fair value of CEG Parent common stock issued Business Combination, Consideration Transferred, Equity Interest Name Awards Close in Time to MNPI Disclosures, Individual Name 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. Energy [Domain] Energy [Domain] Total Volume Derivative, Nonmonetary Net Notional Buy (Sell) Amount Derivative, Nonmonetary Net Notional Buy (Sell) Amount Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total Other Commitment 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 Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Renewable energy credit obligation Renewable energy credit obligation Energy Marketing Accounts Payable Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Outstanding Commercial Paper Line of Credit Facility, Remaining Borrowing Capacity Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Nuclear decommissioning trust funds Nuclear decommissioning trust funds Decommissioning Fund Investments Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Capital Allocation Plan Capital Allocation Plan [Member] Capital Allocation Plan Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Inventories Inventories Increase (Decrease) in Inventories Government Assistance [Line Items] Government Assistance [Line Items] 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. Cash collateral held Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Other tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Accumulated depreciation and amortization Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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. Accretion expense ARO accretion Asset Retirement Obligation, Accretion Expense Senior unsecured notes Senior Notes [Member] Defined Contribution Plan [Table] Defined Contribution Plan [Table] ISO-NE ISO-NE [Member] ISO-NE Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability All Executive Categories All Executive Categories [Member] Common stock (No par value, 1,000 shares authorized, 362 and 312 shares outstanding, respectively) Common Stock, Value, Issued Commitments and contingencies (Note 15) Commitments and contingencies (Note 15) Commitments and Contingencies 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. Assets measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] MW of generation Capacity Of Facility Of Company Owned Generation Facilities Capacity of facility of company owned solar distribution generation facilities. Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Business Combination [Axis] Business Combination [Axis] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Maximum exposure Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Noncontrolling Interests Noncontrolling Interests Noncontrolling Interest [Member] Other accounts receivable Other Accounts Receivable [Member] Other Accounts Receivable Equity ownership Equity Method Investment, Ownership Percentage Assets, Total Assets, Total [Member] Short-term Debt [Line Items] Short-Term Debt [Line Items] Gas revenues Gas Revenue [Member] Gas Revenue PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Other Power Regions Constellation Other Regions [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. Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Long-Term Debt, including amounts due within one year Debt Instrument, Fair Value Disclosure Scenario [Axis] Scenario [Axis] Net fair value of derivative contracts containing this feature Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Senior Unsecured Notes Senior Unsecured Notes [Member] Senior Unsecured Notes Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Accounts receivable Accounts receivable Increase (Decrease) in Receivables Capital expenditures Capital expenditures Payments to Acquire Property, Plant, and Equipment PJM PJM [Member] PJM Name Forgone Recovery, Individual Name Gross receipts Utilities Operating Expense, Taxes Net fair value changes related to derivatives Net fair value changes related to derivatives Total Unrealized Gain (Loss) on Derivatives 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] Weighted average interest rate Debt, Weighted Average Interest Rate Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Effective settlement of preexisting relationships Business Combination, Consideration Transferred, Settlement of Preexisting Relationships Business Combination, Consideration Transferred, Settlement of Preexisting Relationships 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 Calpine Senior Unsecured Notes Calpine Senior Unsecured Notes [Member] Calpine Senior Unsecured Notes Antelope Valley Antelope Valley [Member] Antelope Valley is a wholly owned indirect subsidiary of EGR IV Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Geographical [Axis] Geographical [Axis] Other assets and liabilities Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Operating revenues Business Combination, Pro Forma Information, Pro Forma Revenue Forecast Forecast [Member] Related Party, Name [Domain] Related Party, Name [Domain] Related Party, Name [Domain] Depreciation and amortization Depreciation and amortization Cost, Depreciation and Amortization Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Internally rated — non-investment grade Internal Noninvestment Grade [Member] Pension and non-pension postretirement benefit costs Pension and Other Postretirement Benefits Cost (Reversal of Cost) Earnings per average common share Earnings Per Share [Abstract] Total other income and (deductions) Nonoperating Income (Expense) Calpine Senior Secured Notes Calpine Senior Secured Notes [Member] Calpine Senior Secured Notes GPC First-Lien Senior Secured Term Loan, Sub-Facility GPC First-Lien Senior Secured Term Loan, Sub-Facility [Member] GPC First-Lien Senior Secured Term Loan, Sub-Facility Incremental commitments Line of Credit Facility, Maximum Borrowing Capacity, Incremental Commitments Line of Credit Facility, Maximum Borrowing Capacity, Incremental Commitments Exchange of Calpine senior notes for Constellation senior notes Exchange of Calpine senior notes for Constellation senior notes Noncash or Part Noncash Acquisition, Debt Assumed Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Cash equivalents Cash Equivalents, Nuclear Decommissioning Trust Fund [Member] Cash Equivalents NDT [Member] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] Government Assistance, Type [Domain] Government Assistance, Type [Domain] Unamortized energy contracts(b) Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts Business Combination, Recognized Liability Assumed, Unamortized Energy Contracts Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Number of counterparties Number of Counterparties Represents number of counterparties with a concentrated credit risk greater than 10% of net exposure. External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Equity investments without readily determinable fair values Equity Investments Without Readily Determinable Fair Values [Member] Equity Investments Without Readily Determinable Fair Values Award Timing Disclosures [Line Items] Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Service cost Defined Benefit Plan, Service Cost Employee incentive plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Net Outstanding commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] OCI before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Distributions to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Capped call option contracts Equity-Classified Written Call Option, Modification, Equity Issuance, Increase (Decrease) in Equity, Amount Net income (loss) attributable to common shareholders Net Income (Loss) Attributable to Parent Authorized sale of receivables Accounts Receivable Sales Program, Authorized Sale Accounts Receivable Sales Program, Authorized Sale Nuclear fuel Amortization of Nuclear Fuel CWIP Construction in Progress [Member] Other accrued expenses Other Accrued Liabilities, Current Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current [Abstract] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Qualified NDT fund income and losses Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total equity Beginning Balance Ending Balance Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Electric Assets Electric Assets [Member] Electric Assets Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Other revenue sources(e) Revenue Not from Contract with Customer Adoption Date Trading Arrangement Adoption Date Energy Efficiency Project Financing Energy Efficiency Project Financing [Member] Energy Efficiency Project Financing Customer Relationships Customer Relationships [Member] Operating income (loss) Operating Income (Loss) Retained earnings (deficit) Undistributed earnings (deficit) Retained Earnings (Accumulated Deficit) NDT fund investments Decommissioning Fund Investments, Fair Value Restricted cash Restricted cash [Member] Restricted cash [Member] 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] Average Arithmetic Average [Member] Extended period term Line of Credit Facility, Extended Term Period Line of Credit Facility, Extended Term Period Class of Stock [Axis] Class of Stock [Axis] Gains (losses) on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Receivables from and payables to affiliates, net Increase (Decrease) in Due to Related Parties 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. 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] 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. Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Other, net Other, net Total Other Nonoperating Income (Expense) 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 Business Combination Business Combination [Table Text Block] 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 Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total merger consideration Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill 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. Variable Rate [Domain] Variable Rate [Domain] All Adjustments to Compensation All Adjustments to Compensation [Member] Economic hedges Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Electricity Electricity [Member] Amendment Flag Amendment Flag OPEB Other Postretirement Benefits Plan [Member] Termination Date Trading Arrangement Termination Date Other liabilities Business Combination, Recognized Liability Acquired, Asset Held for Sale, Other Liabilities Business Combination, Recognized Liability Acquired, Asset Held for Sale, Other Liabilities Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Receivable [Domain] Receivable [Domain] Plant Type [Axis] Plant Type [Axis] Plant Type Operating revenues Business Combination, Acquiree's Revenue since Acquisition Date, Actual 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). Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Segment Reporting [Abstract] Segment Reporting [Abstract] Supplemental Statement of Operations Information Supplemental Statement of Operations Information [Table Text Block] Supplemental Statement of Operations Information Debt Disclosure [Abstract] Debt Disclosure [Abstract] RPG Nonrecourse Debt RPG Nonrecourse Debt [Member] RPG Nonrecourse Debt Other income and (deductions) Other income and (deductions) Nonoperating Income (Expense) [Abstract] Scenario [Domain] Scenario [Domain] Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff New York Constellation New York [Member] Accrued litigation, current Estimated Litigation Liability, Current Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Consolidated Entities [Axis] Consolidated Entities [Axis] Other current assets Business Combination, Recognized Asset Acquired, Unamortized Energy Contracts, Current Business Combination, Recognized Asset Acquired, Unamortized Energy Contracts, Current Calpine Term Loan B-10 Calpine Term Loan B-10 [Member] Calpine Term Loan B-10 Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 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. Non-investment grade External Credit Rating, Noninvestment Grade [Member] Insider Trading Arrangements [Line Items] Product and Service, Other Product and Service, Other [Member] ComEd Commonwealth Edison Co Affiliate [Member] Commonwealth Edison Co Affiliate. Total liabilities Total liabilities Total liabilities Liabilities Line of credit facility, fee rate Line of Credit Facility, Commitment Fee Percentage Customer accounts receivable Customer Accounts Receivable [Member] Customer Accounts Receivable Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Letters of credit posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Employee benefit trusts and investments Employee Benefit Trusts and Investments [Member] Employee Benefit Trusts and Investments Debt, noncurrent Debt assumed Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Mid-Atlantic Constellation Mid Atlantic [Member] Represents the Mid-Atlantic segment of Exelon Corporation and Exelon Generation Company, LLC. Unamortized debt issuance costs Unamortized Debt Issuance Expense Variable Rate [Axis] Variable Rate [Axis] Consolidation Items [Axis] Consolidation Items [Axis] Natural gas, oil, and emission allowances Energy Related Inventory, Natural Gas in Storage 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] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] CCFC First-Lien Senior Secured Term Loan Facility CCFC First-Lien Senior Secured Term Loan Facility [Member] CCFC First-Lien Senior Secured Term Loan Facility