Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] High Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Carrying Amount Reported Value Measurement [Member] Net Income/(Loss) Available for Common Stockholders Net Income (Loss) Available to Common Stockholders, Diluted Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Derivative instruments Derivative Instruments and Hedges, Noncurrent Total operating revenue Operating Revenues [Member] Operating Revenues [Member] Long-term-capital allocation policy, target allocation, percentage of cash available for allocation after debt reduction to be returned to shareholders Capital Allocation Policy, Long-Term Target Allocation, Return To Shareholders, Percentage Of Net Cash Available After Debt Reduction Capital Allocation Policy, Long-Term Target Allocation, Return To Shareholders, Percentage Of Net Cash Available After Debt Reduction Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Customers Number of customers Number Of Customers Number Of Customers Consolidated Entities [Axis] Consolidated Entities [Axis] Average price paid per share (in usd per share) Shares Acquired, Average Cost Per Share Less: Revenues accounted for under topics other than ASC 606 and ASC 815 Revenue Not from Contract with Customer, Other Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Emissions Emissions [Member] Details pertaining to the emission allowances, which is considered as a derivative commodity. Effective Tax Rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Property, plant and equipment, net Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Accretion of asset retirement obligations Asset Retirement Obligation, Accretion Expense, Net Asset Retirement Obligation, Accretion Expense, Net Current portion of long-term debt and finance leases Business Combination, Recognized Liability Assumed, Long-Term Debt and Finance Leases, Current Business Combination, Recognized Liability Assumed, Long-Term Debt and Finance Leases, Current Other Comprehensive (Loss)/Income Other Comprehensive Income (Loss), Net of Tax [Abstract] Commodity contracts - current Commodity Contract Current [Member] The current portion of a derivative instrument whose primary underlying risk is tied to commodity prices. Counterparty Risk by Investment Grade [Axis] Counterparty Risk by Investment Grade [Axis] The counter party risk exposure by investment grades. Total other assets Business Combination, Recognized Asset Acquired, Asset, Noncurrent Consolidated Entities [Domain] Consolidated Entities [Domain] Related Party Transactions Related Party Transactions Disclosure [Text Block] Senior Notes, due 2036 6.000% Senior Notes due 2036 [Member] 6.000% Senior Notes due 2036 Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Common stock, par or value (in usd per share) Common Stock, Par or Stated Value Per Share Exchange [Domain] Exchange [Domain] Other Liabilities Liabilities, Noncurrent [Abstract] Schedule of Stock by Class, Equity [Roll Forward] Schedule of Stock by Class, Equity [Roll Forward] Schedule of Stock by Class, Equity [Roll Forward] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total current liabilities Current liabilities Liabilities, Current Customer relationships, net Customer Relationships Customer Relationships [Member] Derivative instruments Derivative Liability, Current Entity Address, City or Town Entity Address, City or Town New Secured Notes New Secured Notes [Member] New Secured Notes Derivatives instruments Business Combination, Recognized Liability Assumed, Derivative Liability, Noncurrent Business Combination, Recognized Liability Assumed, Derivative Liability, Noncurrent Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Derivative instruments Business Combination, Recognized Asset Acquired, Derivative Assets, Noncurrent Business Combination, Recognized Asset Acquired, Derivative Assets, Noncurrent Intangible assets, net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount East East Segment [Member] East Segment Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Energy revenue Energy Revenue [Member] Energy Revenue [Member] Other comprehensive (loss)/income Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Schedule of Segment Reporting Segment Reporting [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Reconciliation of Contractual Obligations of Consumer Financing Program Recognized at Fair Value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Period of estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements (in years) Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period Total current liabilities Business Combination, Recognized Liability Assumed, Liability, Current Document Period End Date Document Period End Date Common stock proposed annual dividend (in usd per share) Dividends Payable, Amount Per Share Preferred stock, shares outstanding (in shares) Preferred, Balance as of beginning of period (in shares) Preferred, Balance as of end of period (in shares) Preferred Stock, Shares Outstanding Debt issuance amount Debt Instrument, Face Amount Basic income/(loss) per share: Earnings Per Share, Basic [Abstract] Net assets Net Assets Derivatives by Underlying Assets [Axis] Derivatives by Underlying Assets [Axis] Derivatives by the underlying asset from which its value is derived. Cedar Bayou 5 TEF loan, due 2045 Cedar Bayou 5 TEF loan, due 2045 [Member] Cedar Bayou 5 TEF loan, due 2045 Derivatives by Underlying Assets [Domain] Derivatives by Underlying Assets [Domain] Derivatives by Underlying Assets [Domain] Gross Amounts of Recognized Assets / Liabilities Fair Value of Gross Derivative Assets/(Liabilities), Net Fair value of gross derivative assets less fair value of gross derivative liabilities. Position [Axis] Position [Axis] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Prepayments and other current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepayments And Other Current Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepayments And Other Current Assets Current portion of operating lease liabilities Operating Lease, Liability, Current NYSPSC settlement agreement, legacy customers, settlement fund established NYSPSC Retail Reset Order, Settlement Agreement, Legacy Customers Settlement Fund, Amount NYSPSC Retail Reset Order, Settlement Agreement, Legacy Customers Settlement Fund, Amount Schedule of Activity in Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] Income/(Loss) Per Share Earnings Per Share [Text Block] Unbilled revenues (included within Accounts receivable, net - Contracts with customers) Unbilled Contracts Receivable Income/(Loss) per Share Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total Liabilities Liabilities Trading Symbol Trading Symbol Capital expenditures Payments to Acquire Property, Plant, and Equipment Net change in assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Environmental proceedings, disclosure threshold Environmental Proceedings, Disclosure Threshold Environmental Proceedings, Disclosure Threshold Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] G. Alfred Spencer [Member] G. Alfred Spencer Schedule of Purchase Price Allocated Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Power Power [Member] Details pertaining to the power, which is considered as a derivative commodity. Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Direct Energy vs. Burk and Dickson Direct Energy vs. Burk and Dickson Litigation [Member] Direct Energy vs. Burk and Dickson Litigation Adequate Assurance Clauses Adequate Assurance Clauses [Member] Adequate Assurance Clauses [Member] Diluted income/(loss) per share: Earnings Per Share, Diluted [Abstract] Ivanpah Ivanpah [Member] Ivanpah [Member] Schedule of Pre-tax Effects of Economic Hedges Not Designated as Cash Flow Hedges Derivatives Not Designated as Hedging Instruments [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Contracts added from acquisitions Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Acquisition Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis, Unobservable Inputs Reconciliation, Acquisition Dividends per common share (in usd per share) Dividends per common share (in usd per share) Common Stock, Dividends, Per Share, Cash Paid Receivables Facility, due 2027 Receivables Facility [Member] Receivables Facility Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Residential Customers Residential Customers [Member] Residential Customers Goodwill, expected to be tax deductible Business Combination, Goodwill, Expected Tax Deductible, Amount Purchases of emissions allowances Payments For Proceeds From Intangible Assets Payments For Proceeds From Intangible Assets Reconciliation of Beginning and Ending Balances for Financial Instruments that are Recognized at Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Funds Deposited by Counterparties and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Other intangible assets, net Other Intangible Assets [Member] Deferred income taxes Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Tax Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Tax Assets Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Award Timing Predetermined Award Timing Predetermined [Flag] Commodity contracts - long-term Commodity Contract Non Current [Member] The noncurrent portion of a derivative instrument whose primary underlying risk is tied to commodity prices. Property, plant and equipment, net Public Utilities, Property, Plant and Equipment, Net Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Cash consideration (inclusive of preliminary working capital and certain other adjustments of $479 million) Payments to Acquire Businesses, Including Working Capital Adjustments, Gross Payments to Acquire Businesses, Including Working Capital Adjustments, Gross Equity-based awards activity, net APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Net (gain)/loss on sale of assets and disposal of assets Gain (Loss) On Sale And Disposition Of Assets Gain (Loss) On Sale And Disposition Of Assets ESPP, minimum percentage of eligible compensation to purchase shares Employee Stock Purchase Plan, Minimum Percentage of Compensation Eligible Employee Stock Purchase Plan, Minimum Percentage of Compensation Eligible Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Number of company's retail suppliers notified Number Of Company's Retail Suppliers Notified Number Of Company's Retail Suppliers Notified States where entity is located Number of States in which Entity Operates Regulated Operations [Abstract] Payments for acquisitions of businesses and assets, net of cash acquired Payments to Acquire Businesses And Asset Acquisitions, Net Payments to Acquire Businesses And Asset Acquisitions, Net Changes in derivative instruments Increase (Decrease) in Derivative Assets and Liabilities Depreciation of property, plant and equipment Depreciation Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Senior Secured First Lien Notes, due 2030 4.734% Senior Secured First Lien Notes Due 2030 [Member] 4.734% Senior Secured First Lien Notes Due 2030 Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Texas Generation Portfolio Texas Generation Portfolio [Member] Texas Generation Portfolio Accounts receivable, net - Accounted for under topics other than ASC 606 Accounts Receivable, Other [Member] Accounts Receivable, Other LSP Portfolio Purchase Price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Current portion of long-term debt and finance leases Long-Term Debt and Lease Obligation, Current Expiration Date Trading Arrangement Expiration Date Senior Notes, due 2031 3.625% Senior Unsecured Notes Due 2031 [Member] 3.625% Senior Unsecured Notes Due 2031 Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Assets [Abstract] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Assets Total Stockholders’ Equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Capacity revenue Capacity Revenue [Member] Capacity Revenue [Member] Accounts receivable, net - Affiliate Affiliated Entity [Member] Dividends [Abstract] Dividends [Abstract] Acquisition-related transaction and integration costs Business Combination Acquisition and Integration Costs Business Combination Acquisition and Integration Costs Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Accounts receivable, net Business Combination, Recognized Asset Acquired, Receivable, Current West/Other West and Other Segment [Member] West and Other Segment Discounts, net of premiums Debt Instrument, Unamortized Discount (Premium), Net Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Litigation Status [Axis] Litigation Status [Axis] Net income/(loss) Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Number of states challenging the EPA's rule Number Of States Challenging The Environmental Protection Agency's Mercury And Air Toxics Standards Number Of States Challenging The Environmental Protection Agency's Mercury And Air Toxics Standards Derivative assets: Derivative Asset [Abstract] Segments [Domain] Segments [Domain] Segments [Domain] Interest Rate Swap Interest Rate Swap [Member] Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Schedule of Other Balance Sheet Information Supplemental Balance Sheet Disclosures [Table Text Block] Supplemental Balance Sheet Disclosures Schedule of Purchase Obligations by Fiscal Year Contractual Obligation, Fiscal Year Maturity [Table Text Block] Less debt issuance costs Debt Issuance Costs, Net Average price paid per share (in usd per share) Accelerated Share Repurchases Average Price Paid Per Share, Excluding Excise Tax Accelerated Share Repurchases Average Price Paid Per Share, Excluding Excise Tax Retail revenue Products And Services, Retail Revenue [Member] Products And Services, Retail [Member] Business Combination [Table] Business Combination [Table] Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount (Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) Secured Debt Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Total operating costs and expenses Costs and Expenses Interest rate % Debt Instrument, Interest Rate, Stated Percentage Common stock dividends and dividend equivalents declared Dividends, Common Stock, Cash Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Other non-current assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent ASSETS Assets [Abstract] Acquisition, shares issued (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Insider Trading Policies and Procedures [Line Items] Reversal of acquired loss positions related to economic hedges Reversal Previously Recognized, Unrealized Gains (Losses) Acquired as Part of Acquisition Economic Hedges Amount reversed into entity's statement of operations for previously recognized unrealized (gains) losses on settled positions related to acquired economic hedges. Prepayments and other current assets Prepaid Expense and Other Assets, Current Derivative instruments Business Combination, Recognized Liability Assumed, Derivative Liability, Current Business Combination, Recognized Liability Assumed, Derivative Liability, Current Payment for capped calls including conversion premium Payments for Derivative Instrument, Financing Activities Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Change in Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Senior Notes, due 2034 6.250% Senior Notes Due 2034 [Member] 6.250% Senior Notes Due 2034 Property, plant and equipment accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in-capital Additional Paid in Capital, Common Stock Equity [Abstract] Equity [Abstract] 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] Number of states supporting the EPA's repeal of the ACE Rule and revision of GHG regulations Number Of States Supporting The Environmental Protection Agency's Repeal Of The ACE Rule And Revision Of Regulation Of GHG Emissions Number Of States Supporting The Environmental Protection Agency's Repeal Of The ACE Rule And Revision Of Regulation Of GHG Emissions Number of power generating facilities acquired Acquisition, Number Of Power Generating Facilities Acquired Acquisition, Number Of Power Generating Facilities Acquired Non Recourse Debt Non Recourse Debt [Member] Represents the non-recourse debt. Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Series A Preferred Stock dividends Series A Preferred Stock dividends Dividends, Preferred Stock, Cash Preferred stock, dividend rate, percentage Preferred Stock, Dividend Rate, Percentage Schedule of Components of Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Foreign exchange contracts - current Foreign Exchange Contract, Current [Member] Foreign Exchange Contract, Current Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Volatilities Measurement Input, Option Volatility [Member] 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] Stock consideration Business Combination, Consideration Transferred, Equity Interest Statement [Line Items] Statement [Line Items] Total Assets Total assets Assets Derivative, nonmonetary notional amount, energy measure (MMBtu/MW/Day) Derivative, Nonmonetary Notional Amount, Energy Measure Counterparty Risk by Institution [Axis] Counterparty Risk by Institution [Axis] The counter party risk exposure by institutions involved. Mark-to-market for economic hedging activities Total unrealized mark-to-market gains/(losses) for economic hedging activities Unrealized Gain (Loss) on Derivatives, Mark To Market, Economic Hedging Activities Unrealized Gain (Loss) on Derivatives, Mark To Market, Economic Hedging Activities Operating Segments Operating Segments [Member] Counterparty credit risk exposure to certain counterparties, threshold (as a percent) Counterparty Credit Risk Exposure, Percentage Threshold Represents the threshold percentage for disclosure of counterparty credit exposure. Interest expense Interest expense Interest Expense, Nonoperating Total Liabilities Business Combination, Recognized Liability Assumed, Liability Derivative asset, NPNS election Derivative Asset, Normal Purchase Normal Sale Scope Election Derivative Asset, Normal Purchase Normal Sale Scope Election PEO PEO [Member] Counterparty Risk by Investment Grade [Domain] Counterparty Risk by Investment Grade [Domain] Represents the counter party risk exposure by investment grades. Tender offer interest rate, percentage Debt Tender Offer, Interest Rate, Stated Percentage Debt Tender Offer, Interest Rate, Stated Percentage Other non-current liabilities Other Liabilities, Noncurrent Goodwill Balance beginning of period Balance end of period Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Term Loan B, due 2033 Term Loan B Due 2033 [Member] Term Loan B Due 2033 Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Shares repurchased from LS Power Capital Allocation Plan, 2023, LS Power Repurchases [Member] Capital Allocation Plan, 2023, LS Power Repurchases Retained Earnings Retained Earnings [Member] Non-current operating lease liabilities Operating Lease, Liability, Noncurrent Revolving Credit Facility Revolving Credit Facility [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common, Outstanding, as of beginning of period (in shares) Common, Outstanding, as of end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Estimated Carrying Amounts and Fair Values of Long-term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Credit Default Swap Facility Credit Default Swap Facility [Member] Credit Default Swap Facility Income per Weighted Average Common Share — Diluted (in usd per share) Income per weighted average common share — diluted (in usd per share) Earnings Per Share, Diluted Prepayments and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Litigation Case [Domain] Litigation Case [Domain] Amortization of customer relationships and other intangible assets Intangible Asset, Finite-Lived, Amortization Expense Reversal of previously recognized unrealized losses on settled positions related to trading activity Reversal Previously Unrecognized, Unrealized Gains (Losses) Settled Positions Trading Activity Amount reversed into entity's statement of operations for previously recognized unrealized (gains) losses on settled positions related to trading activities. Proceeds from credit facilities Proceeds from Long-Term Lines of Credit Schedule of Offsetting of Derivatives by Counterparty Assets Offsetting Assets [Table Text Block] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax LS Power entities share repurchases LS Power Entities Share Repurchases [Member] LS Power Entities Share Repurchases Capital Allocation Plan, Open Market Repurchases Capital Allocation Plan, Open Market Repurchases [Member] Capital Allocation Plan, Open Market Repurchases [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Acquisition working capital and other adjustments Business Combination, Consideration, Working Capital And Other Adjustments Business Combination, Consideration, Working Capital And Other Adjustments Derivative contracts, excluding NPNS elected Derivative Asset, Excluding NPNS Elected, Subject to Master Netting Arrangement, Before Offset Derivative Asset, Excluding NPNS Elected, Subject to Master Netting Arrangement, Before Offset Settlement of Capped Call Options (in shares) Settlement Or Partial Settlement Of Capped Call Options, Shares Settlement Or Partial Settlement Of Capped Call Options, Shares Net Amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Debt conversion, shares issued (in shares) Debt Conversion, Converted Instrument, Shares Issued Other Accounts Receivable, Allowance for Credit Loss, Other Accounts Receivable, Allowance for Credit Loss, Other Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Estimated excise tax excluded Share Repurchase Program, Excise Tax Equity Method Investment [Table] Equity Method Investment [Table] Derivative liabilities, NPNS election Derivative Liabilities, Normal Purchase Normal Sale Scope Exception Derivative Liabilities, Normal Purchase Normal Sale Scope Exception Operating Income Operating income/(loss) Operating Income (Loss) Estimated future fixed fee performance obligations Revenue, Remaining Performance Obligation, Amount Senior Secured First Lien Notes, due 2035 5.407% Senior Secured First Lien Notes due 2035 [Member] 5.407% Senior Secured First Lien Notes due 2035 Proceeds from issuance of long-term debt Proceeds from Issuance of Debt Dak Liyanearachchi [Member] Dak Liyanearachchi Senior Secured First Lien Notes, due 2027 2.450% Senior Secured Notes Due 2027 [Member] 2.450% Senior Secured Notes Due 2027 Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Senior Notes, due 2029 5.750% Senior Notes Due 2029 [Member] 5.750% Senior Notes Due 2029 Equity Securities Equity Securities [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common, Balance as of beginning of period (in shares) Common, Balance as of end of period (in shares) Common Stock, Shares, Issued Net Amount Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral 2028 Purchase Obligation, to be Paid, Year Two Cost of operations (excluding depreciation and amortization shown below) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Liabilities [Abstract] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Liabilities Total derivative liabilities valued with prices provided by models and other valuation techniques (as a percent) Derivative Liability, Fair Value Determined Using Valuation Techniques, Percentage Derivative Liability, Fair Value Determined Using Valuation Techniques, Percentage Accounts receivable, net Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Non-current operating lease liabilities Business Combination, Recognized Liability Assumed, Operating Lease Liability, Noncurrent Business Combination, Recognized Liability Assumed, Operating Lease Liability, Noncurrent Income before income taxes Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Net unrealized gains/(losses) on open positions related to economic hedges Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Termination Date Trading Arrangement Termination Date Consumer Financing Program - long-term Consumer Financing Program Noncurrent [Member] Consumer Financing Program Noncurrent Number of gas-fired facilities acquired Business Combination, Number Of Gas-Fired Facilities Acquired Business Combination, Number Of Gas-Fired Facilities Acquired Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Deferred gains/losses on NPNS contracts - current Derivative Contract-NPNS Current [Member] Derivative Contract-NPNS Current Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net Amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Uncertain tax benefits, penalties and interest accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Capital Allocation Plan [Domain] Capital Allocation Plan [Domain] Explains details pertaining to the different capital allocation plans. Fair Value as of Grant Date Award Grant Date Fair Value Purchases New contractual obligations Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Debt redemption price, percentage Debt Instrument, Redemption Price, Percentage Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration T.H. Wharton TEF loan, due 2045 T.H. Wharton TEF loan Due 2045 [Member] T.H. Wharton TEF loan Due 2045 Company's exposure before collateral expected to roll off (as a percent) Counterparty Credit Risk Exposure Percentage Of Credit Risk Roll Off The percentage of net counterparty credit exposure that rolls-off by the end of 2012. Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name LS Power Portfolio LS Power Portfolio [Member] LS Power Portfolio Nature of Business and Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Revenue Revenues Amortization of customer acquisition costs Amortization of Deferred Sales Commissions Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Home Home Customer [Member] Home Customer ESPP, maximum percentage of eligible compensation Employee Stock Purchase Plan, Maximum Percentage of Compensation Eligible This element represents the maximum percentage of eligible compensation, which can be withheld by employees to purchase shares of the entity. Deferred income taxes Business Combination, Recognized Asset Acquired, Deferred Tax Asset Goodwill [Roll Forward] Goodwill [Roll Forward] Operating Costs and Expenses Operating Costs and Expenses [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Utilities, energy merchants, marketers and other Utilities Energy Merchants Marketers And Other [Member] Represents the information pertaining to utilities, energy, merchants, marketers and other. Schedule of Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Collateral due on net liability position that has not been called by a certain marginable agreement counterparty Derivative, Net Liability Position, Aggregate Fair Value Fair Value of Financial Instruments Fair Value Disclosures [Text Block] NYSE Texas NYSE TEXAS, INC. [Member] Level 3 Level 3 Fair Value, Inputs, Level 3 [Member] Changes in collateral deposits in support of risk management activities Changes in Collateral Deposits Supporting Energy Risk Management Activities Changes in cash collateral deposits for contracts supporting energy risk management activities. Total number of shares purchased (in shares) Treasury Stock, Shares, Acquired Net Asset Value Fair Value Measured at Net Asset Value Per Share [Member] Senior Lien Senior Lien [Member] Foreign exchange contracts - long-term Foreign Exchange Contract, Noncurrent [Member] Foreign Exchange Contract, Noncurrent Share repurchases Amounts paid for shares repurchased Treasury Stock, Value, Acquired, Cost Method Cash collateral paid in support of energy risk management activities Cash Collateral Posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Cash Collateral (Held) / Posted Derivative, Collateral, Obligation to Return Cash Net Of Derivative, Collateral, Right to Reclaim Cash Derivative, Collateral, Obligation to Return Cash Net Of Derivative, Collateral, Right to Reclaim Cash Funds deposited by counterparties Funds deposited by counterparties Funds Deposited by Counterparties The amount of cash collateral received from hedge counterparties in support of energy risk management activities for which there is an offsetting liability within current liabilities. These amounts are segregated into separate accounts that are not contractually restricted but, based on the entity's intention, are not available for the payment of the entity's general corporate obligations. Depending on market fluctuations and the settlement of the underlying contracts, the entity will refund this collateral to the counterparties pursuant to the terms and conditions of the underlying trades. Non-NEOs Non-NEOs [Member] NYSPC agreement, settlement fund, legacy customers, special discount rate, enrollment period NYSPC Settlement Agreement, Settlement Fund, Legacy Customers, Special Discount Rate, Enrollment Period NYSPC Settlement Agreement, Settlement Fund, Legacy Customers, Special Discount Rate, Enrollment Period Cash paid to acquire business Payments to Acquire Businesses, Gross Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Schedule of Long-term Debt and Finance Leases Schedule of Debt [Table Text Block] NYSPC settlement agreement distribution to certain low-income customers, amount NYSPC Settlement, Distribution to Certain Low-Income Customers, Amount NYSPC Settlement, Distribution to Certain Low-Income Customers, Amount Customer [Domain] Customer [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Valuation Technique Option Model Valuation Technique Option Model [Member] Valuation Technique Option Model Senior Notes, due 2033 6.000% Senior Notes Due 2033 [Member] 6.000% Senior Notes Due 2033 Payments for share repurchase activity and excise tax Payments for Repurchase of Common Stock Deferred revenue current Contract with Customer, Liability, Current Thereafter Purchase Obligation, To Be Paid, After Year Four Purchase Obligation, To Be Paid, After Year Four Statistical Measurement [Axis] Statistical Measurement [Axis] Award Type Award Type [Axis] Interest rate contracts Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Collateral Prepayment Rates Measurement Input, Collateral Prepayment Rate [Member] Measurement Input, Collateral Prepayment Rate Net unrealized (losses)/gains on open positions related to trading activity Derivative Unrealized Gains on Open Positions Related to Trading Activity, Net This element represents the amount recorded in the entity's statement of operations for net unrealized gains (losses) on open positions related to trading activities. Product and Service [Axis] Product and Service [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock Common Stock [Member] Excise tax, accrued Excludes or includes accrued excise tax Share Repurchase Program, Excise Tax, Payable Investments in securities (classified within other current and non-current assets) Debt Securities, Available-for-Sale Derivative Instruments Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset Credit Loss Rates Measurement Input, Loss Severity [Member] Derivative Contract [Domain] Derivative Contract [Domain] Foreign currency translation adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total Liabilities and Stockholders’ Equity Liabilities and Equity Accounts receivable, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable, After Allowance For Credit Loss Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable, After Allowance For Credit Loss Employee Stock Option Share-Based Payment Arrangement, Option [Member] Non-Investment grade/Non-Rated External Credit Rating Not Rated [Member] Represents underlying referenced credits or entities, with respect to guarantees, for which ratings are not available. Capitalization, Equity [Table] Capitalization, Equity [Table] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Number of facilities Number of plants Number of Facilities Number of Facilities Tabular List, Table Tabular List [Table Text Block] Credit Derivatives Contract Type [Axis] Credit Derivatives Contract Type [Axis] Incremental shares attributable to the potential share settlements of the Convertible Senior Notes (if converted method) (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Option Indexed to Issuer's Equity [Line Items] Option Indexed to Issuer's Equity [Line Items] Other Assets Assets, Noncurrent [Abstract] Preferred stock; 10,000,000 shares authorized; 650,000 Series A shares issued and outstanding at June 30, 2026 and December 31, 2025, aggregate liquidation preference of $650 at June 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Transfers out of Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 Capacity Contracts Capacity Contracts [Member] Capacity Contracts Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Hedging Designation [Axis] Hedging Designation [Axis] Lightning Term Loan, due 2031 Lightning Term Loan Due 2031 [Member] Lightning Term Loan Due 2031 Credit Facility [Axis] Credit Facility [Axis] Derivative instruments Derivative Instruments and Hedges, Assets Total assets Assets, Fair Value Disclosure Volumetric Underlying Derivative Transactions Volumetric Underlying Derivative Transactions [Abstract] Volumetric Underlying Derivative Transactions [Abstract] Long-term debt and finance leases Total long-term debt and finance leases Long-Term Debt and Lease Obligation Name Measure Name Generation capacity (in MW) Power Generation Capacity, Megawatts The generation capacity of the entity's power generation facilities as of the balance sheet date, expressed in megawatts. Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Blended Federal and state tax rate percentage Effective Income Tax Rate Reconciliation, Blended Federal Statutory And State And Local Income Tax Rate Percentage Effective Income Tax Rate Reconciliation, Blended Federal Statutory And State And Local Income Tax Rate Percentage Derivative, non-monetary notional amount (in shares) Derivative, Non-monetary Notional Amount, Other Derivative, Non-monetary Notional Amount, Other Additional Paid-In Capital Additional Paid-in Capital [Member] Sales of emissions allowances Proceeds from Sale of Intangible Assets Total unrealized mark-to-market (losses)/gains for trading activity Unrealized Gain (Loss) on Derivatives, Mark To Market, Trading Activities Unrealized Gain (Loss) on Derivatives, Mark To Market, Trading Activities Operating expenses Segment, Operating Expenses Segment, Operating Expenses Name Trading Arrangement, Individual Name Schedule of Contract Assets and Liabilities [Table] Schedule Of Contract Assets And Liabilities [Table] Schedule Of Contract Assets And Liabilities [Table] Cash and cash equivalents Cash and Cash Equivalent Position [Domain] Position [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Total depreciation and amortization Depreciation, Depletion and Amortization Credit Risk Related Contingent Features Credit Risk Related Contingent Features [Abstract] -- None. No documentation exists for this element. -- Shares issued under LTIPs (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Incremental Term Loan B Facility Incremental Term Loan B Facility [Member] Incremental Term Loan B Facility Non-PEO NEO Non-PEO NEO [Member] Estimated counterparty credit risk exposure under certain long term agreements for the next 5 years Estimated Counterparty Credit Risk Exposure to Certain Counterparties This element represents the estimated amount of the counterparty credit risk exposure. Shares repurchased from LS Power LS Power Entities Share Repurchases 2025 Purchase Plan [Member] LS Power Entities Share Repurchases 2025 Purchase Plan Total Purchase Obligation Award Timing Method Award Timing Method [Text Block] Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income/(loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] New York State Public Service Commission New York State Public Service Commission [Member] New York State Public Service Commission Shares issued under ESPP Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Restatement Determination Date: Restatement Determination Date [Axis] Capped call, convertible debt, conversion, premium Capped Call, Convertible Debt, Conversion, Premium Capped Call, Convertible Debt, Conversion, Premium Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid Offsetting Assets and Liabilities [Line Items] [Line Items] for Offsetting Assets and Liabilities [Table] Property, plant and equipment, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Revenue Revenues [Abstract] Derivative net liability position, collateral required for contracts with credit rating contingent feature Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] ESSP, employee maximum eligible annual compensation Employee Stock Purchase Plan, Maximum Eligible Annual Compensation Per Employee Employee Stock Purchase Plan, Maximum Eligible Annual Compensation Per Employee Statistical Measurement [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Derivative Instruments Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Revenue remaining performance obligation period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Auction Prices ($ per MWh) Measurement Input, Auction Price [Member] Measurement Input, Auction Price Customer [Axis] Customer [Axis] Common stock; $0.01 par value; 500,000,000 shares authorized; 225,198,900 and 199,828,615 shares issued and 210,307,902 and 190,376,607 shares outstanding at June 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Equivalent shares purchased in lieu of tax withholdings Payment, Tax Withholding, Share-Based Payment Arrangement Depreciation of property, plant and equipment and amortization of customer relationships and other intangible assets Depreciation, Amortization and Accretion, Net Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Senior Notes, due 2028 Senior Notes due 2028 [Member] Senior Notes due 2028 Restatement Determination Date Restatement Determination Date Deferred gains/losses on NPNS contracts - long-term Derivative Contract-NPNS , Long-Term [Member] Derivative Contract-NPNS , Long-Term Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Power Options Power Options [Member] Power Options Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current Liabilities Liabilities, Current [Abstract] Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Net Notional Volume Buy/(Sell) of NRG's Open Derivative Transactions Broken out by Commodity Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Fair Value Inputs / Range Fair Value Measurement Inputs and Valuation Techniques [Abstract] Generation capacity (in GW) Power Generation Capacity, Gigawatts Power Generation Capacity, Gigawatts Defendants Loss Contingency, Number of Defendants Gain/(Loss) on sale of assets (Loss)/Gain on sale of assets Gain (Loss) on Disposition of Other Assets Loss Contingencies [Table] Loss Contingencies [Table] Foreign Exchange Foreign Exchange [Member] Current portion of operating lease liabilities Business Combination, Recognized Liability Assumed, Operating Lease Liability, Current Business Combination, Recognized Liability Assumed, Operating Lease Liability, Current Total other liabilities Liabilities, Noncurrent Issuance of common stock for acquisition of LSP Portfolio Stock Issued During Period, Value, Acquisitions Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Subtotal all Lightning non-recourse debt Lightning Debt [Member] Lightning Debt PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Assets Assets, Fair Value Disclosure [Abstract] Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Forward Market Price (perMMBtu) or (per MWh) Measurement Input, Commodity Forward Price [Member] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Derivative, notional amount Derivative, Notional Amount Weighted average number of common shares outstanding — basic (in shares) Weighted average number of common shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Summary of NRG's Material Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Loss Contingencies Loss Contingencies [Line Items] Restricted cash Business Combination, Recognized Asset Acquired, Restricted Cash Business Combination, Recognized Asset Acquired, Restricted Cash Accounts payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable Senior Notes, due 2032 3.875% Senior Notes due 2032 [Member] 3.875% Senior Notes due 2032 Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Net Income/(Loss) Available for Common Stockholders Net Income (Loss) Available to Common Stockholders, Basic Payments of dividends to preferred and common stockholders Payments of Ordinary Dividends Capital Allocation Plan [Axis] Capital Allocation Plan [Axis] Explains the different capital allocation plans. Convertible Senior Notes Capped Calls Convertible Senior Notes Capped Calls [Member] Convertible Senior Notes Capped Calls Receivable [Domain] Receivable [Domain] Customer relationships and other intangible assets accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Revolving credit commitments Line of Credit Facility, Maximum Borrowing Capacity Less current maturities Long-Term Debt, Current Maturities Total Share Repurchases under the $3.0 billion authorization Share Repurchase Program 2025 [Member] Share Repurchase Program 2025 Credit reserve change in fair value increase (decrease) Derivative, Increase (Decrease) In Fair Value, Due to Change in Credit Reserve Derivative, Increase (Decrease) In Fair Value, Due to Change in Credit Reserve Treasury stock, at cost; 14,890,998 shares and 9,452,008 shares at June 30, 2026 and December 31, 2025, respectively Treasury Stock, Value Recent Accounting Developments — Guidance Adopted and Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Fair Value, Concentration of Risk [Table] Fair Value, Concentration of Risk [Table] Gain on proceeds from insurance recoveries for Property, plant and equipment, net Gain (Loss) on Disposition of Property Plant Equipment Deferred revenue current Business Combination, Recognized Liability Assumed, Contract With Customer Liability, Current Business Combination, Recognized Liability Assumed, Contract With Customer Liability, Current Total other liabilities Business Combination, Recognized Liability Assumed, Liability, Noncurrent Total long-term debt, including current portion Long-term debt Borrowings outstanding Long-Term Debt 2029 Purchase Obligation, to be Paid, Year Three Cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Cash collateral received in support of energy risk management activities Cash collateral received in support of energy risk management activities Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Changes in Capital Structure Equity [Text Block] Other Income/(Expense) Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Lightning Senior Secured Notes, due 2032 Lightning Senior Secured Notes, due 2032 [Member] Lightning Senior Secured Notes, due 2032 Number of states, FIP, stayed by the U.S. Supreme Court Number Of States, Federal Implementation Plan, Stayed By U.S. Supreme Court Number Of States, Federal Implementation Plan, Stayed By U.S. Supreme Court Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Total liabilities Liabilities, Fair Value Disclosure Segment Reporting Segment Reporting, Policy [Policy Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Consumer Financing Program Consumer Financing Program Consumer financing program Consumer Financing Program [Member] Consumer Financing Program 2027 Purchase Obligation, to be Paid, Year One 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Contract Cost, Acquisitions Contract Cost, Acquisitions [Member] Contract Cost, Acquisitions Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] Counterparty credit exposure to a portion of the Company's counterparties Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure Amortization of financing costs and debt discounts/premiums Amortization of Debt Issuance Costs and Discounts Lien Category [Axis] Lien Category [Axis] Regulatory Matters Regulatory Matters [Text Block] Describes all of the specific regulatory matters that are pending, including the regulatory authorities involved and the potential impacts. Dividends per share of Series A Preferred Stock (in usd per share) Dividends per Series A Preferred Stock (in usd per share) Preferred Stock, Dividends, Per Share, Cash Paid Coal Coal [Member] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Derivative revenue Total unrealized gains/(losses) - commodities and foreign exchange Unrealized Gain (Loss) on Derivatives Number of reportable segments not Disclosed flag NumberOfReportableSegmentsNotDisclosedFlag NumberOfReportableSegmentsNotDisclosedFlag Borrowings Long-Term Debt, Gross Related Party Transactions [Abstract] Related Party Transactions [Abstract] Derivative revenue Products And Services, Derivative Revenue [Member] Products And Services, Derivative Revenue [Member] Compensation Amount Outstanding Recovery Compensation Amount Amortization of capitalized contract costs Amortization of capitalized contract costs related to fulfillment/customer acquisitions Contract amortization Capitalized Contract Cost, Amortization Individual: Individual [Axis] Weighted average number of common shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Lightning Credit Agreement Lightning Credit Agreement [Member] Lightning Credit Agreement Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Senior Unsecured Notes Senior Unsecured Notes [Member] Senior Unsecured Notes Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Uncertain Tax Benefits Income Tax Uncertainties [Abstract] Texas Texas Segment [Member] Texas Segment Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from lines of credit Proceeds from Lines of Credit Accounting for Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Number of states challenging the EPA's repeal of the ACE Rule and revision of GHG regulations Number Of States Challenging The Environmental Protection Agency's Repeal Of The ACE Rule And Revision Of Regulation Of GHG Emissions Number Of States Challenging The Environmental Protection Agency's Repeal Of The ACE Rule And Revision Of Regulation Of GHG Emissions Derivative contracts Derivative liabilities Derivative Liabilities Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Capital Allocation Plan, 2023 Capital Allocation Plan, 2023 [Member] Capital Allocation Plan, 2023 Open market repurchases Share Repurchase Program 2025, Open Market [Member] Share Repurchase Program 2025, Open Market Shares issued under LTIPs Long-term Incentive Plan [Member] Long-term Incentive Plan Treasury Stock Treasury Stock, Common [Member] Letters of credit issued Letters of Credit Outstanding, Amount Subtotal long-term debt and finance leases (including current maturities) Debt and Lease Obligation Tax-exempt bonds Tax-exempt Bonds [Member] Tax-exempt Bonds [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Litigation Status [Domain] Litigation Status [Domain] All Executive Categories All Executive Categories [Member] Senior Notes, due 2029 3.375% Senior Unsecured Notes Due 2029 [Member] 3.375% Senior Unsecured Notes Due 2029 Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Repayments to credit facilities Repayments of Long-Term Lines of Credit Senior Notes, due 2034 5.750% Senior Notes Due 2034 [Member] 5.750% Senior Notes Due 2034 Schedule of NRG's Basic and Diluted Income (Loss) per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Reporting Segment Reporting [Text Block] Low Minimum Minimum [Member] Repayments of long-term debt and finance leases Repayments of Other Debt Equity securities Investments, Fair Value Disclosure Schedule of Disaggregation of Revenue from Contracts with Customer Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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] Derivatives Derivative [Member] Schedule of Changes in NRG's Preferred Stock and Commons Shares Issued and Outstanding Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Business Combination [Line Items] Business Combination [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Term Loan B, due 2031 Term Loan B Due 2031 [Member] Term Loan B Due 2031 Common stock, annual dividend growth rate, percentage Common Stock, Annual Dividend Growth Rate Common Stock, Annual Dividend Growth Rate Exercise Price Award Exercise Price Investments Accounted for by the Equity Method Schedule of Equity Method Investments [Line Items] Segment Reporting Segment Reporting [Line Items] Share repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Proceeds from sales of assets, net Proceeds from Sales of Assets, Investing Activities Senior Secured First Lien Notes, due 2029 Senior Secured First Lien Notes, Due 2029 [Member] Senior Secured First Lien Notes, Due 2029 [Member] Document Quarterly Report Document Quarterly Report 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] Settled Litigation Settled Litigation [Member] Total accounts receivable, net Accounts Receivable, after Allowance for Credit Loss Derivative asset/liability, measurement input Derivative Asset (Liability) Net, Measurement Input Power Contracts Power Contracts [Member] Power Contracts [Member] Derivative liabilities: Derivative Liability [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Total (losses)/gains realized/unrealized included in earnings Total losses included in earnings Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Foreign exchange Foreign Exchange Contract [Member] Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total other expense Nonoperating Income (Expense) Environmental Matters Environmental Loss Contingency Disclosure [Text Block] Regulatory Agency [Axis] Regulatory Agency [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other revenue, derivative Products And Services, Other Derivative Revenue [Member] Products and Services, Other Derivative Revenue [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Finance leases Finance Lease, Liability Regulatory Agency [Domain] Regulatory Agency [Domain] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Financial Institutions Financial Institutions [Member] Represents the information pertaining to the financial institutions. Selling, general and administrative costs (excluding amortization of customer acquisition costs of $93, $68, $180, and $133 respectively, which are included in depreciation and amortization shown separately above) Selling, General and Administrative Expense Revolving Credit Facility Credit Agreement [Member] Credit Agreement [Member] Business Combination [Domain] Business Combination [Domain] Letter of Credit Letter of Credit [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Weighted Average Weighted Average [Member] Underlying Asset Class [Axis] Underlying Asset Class [Axis] All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Net receipts from settlement of acquired derivatives that include financing elements Payments for (Proceeds from) Derivative Instrument, Financing Activities Business Combination [Axis] Business Combination [Axis] Senior Secured First Lien Notes, due 2031 4.955% Senior Secured First Lien Notes Due 2031 [Member] 4.955% Senior Secured First Lien Notes Due 2031 Cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Preferred stock, liquidation preference Preferred Stock, Liquidation Preference, Value Total Derivative Contracts Total Derivative Contracts [Member] Total Derivative Contracts Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges Reversal Previously Recognized, Unrealized Gains (Losses) Settled Positions, Economic Hedges Amount reversed into entity's statement of operations for previously recognized unrealized (gains) losses on settled positions related to economic hedges. Stockholders’ Equity Equity, Attributable to Parent [Abstract] Income Statement Income Statement [Abstract] Shares issued under ESPP (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Senior Notes, due 2029 5.250% Senior Notes Due 2029 [Member] 5.250% Senior Notes Due 2029 [Member] Fair Value Option, Quantitative Disclosures [Line items] Fair Value, Option, Quantitative Disclosures [Line Items] Measured using net asset value practical expedient: Measured Using Net Asset Value Practical Expedient [Abstract] Measured Using Net Asset Value Practical Expedient Deferred income taxes Deferred Income Tax Assets, Net Corporate/Eliminations Eliminations Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Residential Customers, Retail Energy Residential Customers, Retail Energy [Member] Residential Customers, Retail Energy City Area Code City Area Code Renewable Energy Certificates Renewable Energy Certificates [Member] Renewable Energy Certificates [Member] Changes in other working capital: Cash Provided Used by Changes in Other Working Capital [Abstract] Cash Provided Used by Changes in Other Working Capital Consumer Financing Program - current Consumer Financing Program Current [Member] Consumer Financing Program Current Document Information [Table] Document Information [Table] Convertible Debt Securities Convertible Debt Securities [Member] Name Forgone Recovery, Individual Name Concentration of Credit Risk Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Recourse Debt Recourse Debt [Member] Recourse Debt [Member] Derivative, nonmonetary notional amount, mass (ton) Derivative, Nonmonetary Notional Amount, Mass Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Debt difference between principal and fair value, amortized through interest expense over remaining term of debt Debt Instruments, Difference Between Principal And Fair Value, Amortized As Interest Expense Over Remaining Term Debt Instruments, Difference Between Principal And Fair Value, Amortized As Interest Expense Over Remaining Term Deferred gains/losses on NPNS contracts Deferred gains/losses on NPNS contracts(a) Derivative Contract-NPNS [Member] Derivative Contract-NPNS Shares reissuance for ESPP Stock Issued During Period, Value, Employee Stock Purchase Plan New York Stock Exchange NEW YORK STOCK EXCHANGE, INC. [Member] Accounts receivable, net - Contracts with customers Customer Contracts [Member] Business Business Solutions Customers [Member] Business Solutions Customers [Member] Derivative Instruments Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Measurement Basis [Axis] Measurement Basis [Axis] Inventory Business Combination, Recognized Asset Acquired, Inventory, Current Goodwill resulting from the acquisition of LSP Portfolio Goodwill, Acquired During Period Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Series A Preferred Stock Series A Preferred Stock [Member] Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Significant Unobservable Inputs For Fair Values Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Payments of deferred financing costs Payments of Debt Issuance Costs Convertible Senior Notes, due 2048 Convertible Senior Notes Due 2048 [Member] Convertible Senior Notes due 2048 [Member] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Entity Current Reporting Status Entity Current Reporting Status Cash provided by/(used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares purchased for tax withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Accrued expenses and other current liabilities Increase (Decrease) Accrued Expenses and Other Current Liabilities Operating The sum of the net change during the reporting period of accrued expenses and other current liabilities. Accrued expenses is the net change during the reporting period in the aggregate amount of expenses incurred but not yet paid. Other current liabilities is the net change during the reporting period in other expenses incurred but not yet paid. Liabilities Liabilities, Fair Value Disclosure [Abstract] Operating lease right-of-use assets, net Business Combination, Recognized Asset Acquired, Operating Lease Right-Of-Use Assets, Net Business Combination, Recognized Asset Acquired, Operating Lease Right-Of-Use Assets, Net ESPP, exercise price as percentage of fair value Employee Stock Purchase Plan, Exercise Price as Percentage of Fair Value This element represents the exercise price under employee stock purchase plan as a percentage of fair value. Schedule of Total Consideration and Supplemental Information Business Combination [Table Text Block] Schedule of Business Combination, Pro Forma Information Business Combination, Pro Forma Information [Table Text Block] Adjustments to reconcile net income to cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Additional collateral required Additional Collateral, Aggregate Fair Value Closing, share price (in usd per share) Shares Issued, Price Per Share Financial Instruments [Domain] Financial Instruments [Domain] Derivatives assets Derivative Asset Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Generation capacity (MMDth) annually Power Generation Capacity, Million Dekatherms Power Generation Capacity, Million Dekatherms Underlying Securities Award Underlying Securities Amount Amortization of in-the-money contracts and emissions allowances Amortization of Intangibles, In-the-Money Contracts, and Retirement of RECs The aggregate (income) expense recorded in earnings to allocate the cost of out-of-market contracts and intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash (income) expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Fair Value Estimate of Fair Value Measurement [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Commodities and foreign exchange Commodity and Foreign Exchange Contracts [Member] Commodity and Foreign Exchange Contracts 3.000% Cedar Bayou 5 TEF Loan Due 2045 3.000% Cedar Bayou 5 TEF Loan Due 2045 [Member] 3.000% Cedar Bayou 5 TEF Loan Due 2045 Preferred Stock Preferred Stock [Member] Shares issued for the acquisition of the LSP Portfolio (in shares) Stock Issued During Period, Shares, Acquisitions Inventory Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Natural Gas Natural Gas [Member] Details pertaining to the natural gas, which is considered as a derivative commodity. Related Party Transaction [Table] Related Party Transaction [Table] Revenue Business Combination, Acquiree's Revenue since Acquisition Date, Actual Deferred income taxes Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Tax Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Tax Liabilities Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] 2030 Purchase Obligation, to be Paid, Year Four Current Fiscal Year End Date Current Fiscal Year End Date Net counterparty credit exposure to a portion of the Company's counterparties Net Credit Exposure Represents the net exposure of the entity determined as total credit exposure to all counterparties less collateral (cash and letters of credit) held against those positions as of the reporting date. Unrecognized tax benefits, interest Unrecognized Tax Benefits, Interest on Income Taxes Expense Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Greens Bayou 6 TEF loan, due 2045 3.000% Greens Bayou 6 TEF Loan Due 2045 [Member] 3.000% Greens Bayou 6 TEF Loan Due 2045 Shares repurchased (in shares) Stock Repurchased During Period, Shares 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] Common stock dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Preferred stock, dividends declared (in usd per share) Preferred Stock, Dividends Per Share, Declared Measure: Measure [Axis] Schedule of Financial Information for Consolidated VIEs Schedule of Variable Interest Entities [Table Text Block] Credit Derivatives Contract Type [Domain] Credit Derivatives Contract Type [Domain] Treasury stock, shares (in shares) Treasury, Balance as of beginning of period (in shares) Treasury, Balance as of end of period (in shares) Treasury Stock, Common, Shares Schedule of Retirement of Treasury Stock Schedule Of Retirement Of Treasury Stock [Table Text Block] Schedule Of Retirement Of Treasury Stock Total current assets Business Combination, Recognized Asset Acquired, Asset, Current Equity Components [Axis] Equity Components [Axis] Debt repurchased amount Debt Instrument, Repurchase Amount Related Party Related Party [Member] Capitalized contract costs (included in Prepayments and other current assets and Other non-current assets) Capitalized Contract Cost, Net Transfers into Level 3 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Entity Interactive Data Current Entity Interactive Data Current Entity Small Business Entity Small Business Total decrease in assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Sierra Club Et Al V. Midwest Generation LLC Sierra Club Et Al V. Midwest Generation LLC [Member] Sierra Club Et Al V. Midwest Generation LLC [Member] Changes in current and deferred income taxes and liability for uncertain tax benefits Increase (Decrease) in Income Taxes MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Schedule of Net Counterparty Credit Exposure by Industry Sector and by Counterparty Credit Quality Schedule of Net Exposure to Counter Party Credit Exposure [Table Text Block] Disclosure of the net exposure to counterparty credit risk by category. Non-current tax liability for uncertain tax benefits Liability for Uncertainty in Income Taxes, Noncurrent Senior Notes, due 2036 6.125% Senior Notes Due 2036 [Member] 6.125% Senior Notes Due 2036 Other non-current assets Other Assets, Noncurrent Document Type Document Type Aggregate principal redeemed Debt Instrument, Repurchased Face Amount 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] Loss on debt extinguishment Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Gladstone Gladstone Power Station [Member] Represents the information pertaining to Gladstone Power Station. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] FTRs Financial Transmission Rights [Member] Financial Transmission Rights [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenue non-current Contract with Customer, Liability, Noncurrent Investments Accounted for by the Equity Method and Variable Interest Entities Additional Financial Information Disclosure [Text Block] Other non-current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Non-Current Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Non-Current Liabilities Derivative instruments Business Combination, Recognized Asset Acquired, Derivative Assets, Current Business Combination, Recognized Asset Acquired, Derivative Assets, Current Payments for debt extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Income/(Loss) Before Income Taxes Income/(Loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Commitments and Contingencies Commitments and Contingencies Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Capital Allocation Plan, Accelerated Repurchase Agreements Capital Allocation Plan, Accelerated Repurchase Agreements [Member] Capital Allocation Plan, Accelerated Repurchase Agreements Inventory Inventory, Net Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Total other assets Regulated Entity, Other Assets, Noncurrent Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Interest rate contracts long-term Interest Rate Contract Non Current [Member] The noncurrent portion of a derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Bilateral Letter of Credit Facilities Bilateral Letter of Credit Facilities [Member] Bilateral Letter of Credit Facilities Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Schedule of Components of Depreciation and Amortization in the Statement of Income Supplemental Statement Of Income Disclosures [Table Text Block] Supplemental Statement Of Income Disclosures Less: Cumulative dividends attributable to Series A Preferred Stock Less: Cumulative dividends attributable to Series A Preferred Stock Preferred Stock Dividends, Income Statement Impact Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other current liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Investment grade External Credit Rating, Investment Grade [Member] November 2023 Accelerated Share Repurchase Agreements November 2023 Accelerated Share Repurchase Agreements [Member] November 2023 Accelerated Share Repurchase Agreements Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Restricted cash Restricted Cash and Cash Equivalent, Current 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] Comprehensive Income/(Loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Interest rate contracts current Interest Rate Contract Current [Member] The current portion of a derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate. Other non-current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Amortization of unearned equity compensation Share-Based Payment Arrangement, Noncash Expense Increase to existing revolving commitments Line of Credit Facility, Increase in Borrowing Capacity Line of Credit Facility, Increase in Borrowing Capacity Long Long [Member] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Income per Weighted Average Common Share — Basic (in usd per share) Income per weighted average common share — basic (in usd per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Deferred revenues Deferred Revenue Total current assets Accounts receivable, net and Other current assets Assets, Current Treasure shares acquired but not yet paid Treasure Shares Acquired But Not Yet Paid, Value Treasure Shares Acquired But Not Yet Paid, Value Insider Trading Arrangements [Line Items] Net exposure (as a percent) Credit Derivative, Maximum Net Exposure, Percentage Represents the percentage of net counterparty credit exposure of the entity. Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Share Repurchases Class of Treasury Stock [Table Text Block] Commodity contracts Commodities Commodity Contract [Member] 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] Goodwill Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Accrued expenses and other current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Expenses And Other Current Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Expenses And Other Current Liabilities Schedule of Fair value Inputs, Sensitivity Analysis Fair Value Inputs, Sensitivity Analysis [Table Text Block] Fair Value Inputs, Sensitivity Analysis [Table Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] 2026 Purchase Obligation, to be Paid, Remainder of Fiscal Year Derivative instruments Derivative Liability, Noncurrent Collateral Default Rates Measurement Input, Collateral Default Rate [Member] Measurement Input, Collateral Default Rate Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Average price paid per share (in usd per share) Shares Acquired, Average Cost Per Share, Excluding Commissions And Fees Shares Acquired, Average Cost Per Share, Excluding Commissions And Fees Proceeds from issuance of senior notes Proceeds from Issuance of Senior Long-Term Debt Plan Name [Axis] Plan Name [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Derivative liability, measurement input Derivative Liability, Measurement Input Total derivative assets valued with prices provided by models and other valuation techniques (as a percent) Derivative Asset, Fair Value Determined Using Valuation Techniques, Percentage This element represents the portion of total fair value of all derivative assets, which are valued using various valuation techniques including internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Other income, net Other income, net Other Nonoperating Income (Expense) Long-term Debt and Finance Leases Long-Term Debt [Text Block] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Senior Notes, due 2034 5.875% Senior Notes Due 2034 [Member] 5.875% Senior Notes Due 2034 Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Other segment information Segment Reporting, Other Disclosure [Abstract] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Vivint Smart Home Vivint Smart Home Segment [Member] Vivint Smart Home Segment Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Capped Call Options Capped call options Adjustment To Additional Paid In Capital, Purchase Of Capped Call Options Adjustment To Additional Paid In Capital, Purchase Of Capped Call Options Accrued expenses and other current liabilities Business Combination, Recognized Liability Assumed, Accrued Expenses And Other Current Liabilities Business Combination, Recognized Liability Assumed, Accrued Expenses And Other Current Liabilities Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Schedule of Fair Value within the Derivative Instrument Valuation on the Balance Sheets Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Proceeds from insurance recoveries for Property, plant and equipment, net Proceeds From Insurance Recovery, Property, Plant and Equipment, Net Proceeds From Insurance Recovery, Property, Plant and Equipment, Net Consideration Total Preliminary Consideration Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties Collateral Held Cash and Letters of Credit Carrying amount as of the balance sheet date of cash collateral and letters of credit received by the entity on deposit from third parties in support of energy risk management. Commercial And industrial Virtual Power Plant Platform Commercial And industrial Virtual Power Plant Platform [Member] Commercial And industrial Virtual Power Plant Platform Schedule of Offsetting of Derivatives by Counterparty Liabilities Offsetting Liabilities [Table Text Block] Cash collateral paid in support of energy risk management activities Business Combination, Recognized Asset Acquired, Cash Collateral For Support Of Energy Risk Management Business Combination, Recognized Asset Acquired, Cash Collateral For Support Of Energy Risk Management Less: Realized and unrealized ASC 815 revenue Gain (Loss) on Derivative Instruments, Net, Pretax Variable Interest Entities Disclosure [Abstract] Variable Interest Entities Disclosure [Abstract] -- None. No documentation exists for this element. -- Retirement of treasury stock Retirement of treasury stock Treasury Stock, Retired, Cost Method, Amount Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Working capital adjustments Business Acquisition, Working Capital Adjustments, Net Business Acquisition, Working Capital Adjustments, Net Residential Customers , Smart Home Residential Customers , Smart Home [Member] Residential Customers , Smart Home Stock, Class of Stock [Table] Stock, Class of Stock [Table] Total decrease in liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities Net Income/(Loss) Net Income Net income Net income/(loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Total Assets Business Combination, Recognized Asset Acquired, Assets Including Goodwill Business Combination, Recognized Asset Acquired, Assets Including Goodwill Senior Secured First Lien Notes, due 2033 7.000% Senior Secured First Lien Notes due 2033 [Member] 7.000% Senior Secured First Lien Notes due 2033 Current Assets Assets, Current [Abstract] Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Derivatives liabilities Derivative Liability Operating lease right-of-use assets, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Right-Of-Use Assets, Net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Operating Lease Right-Of-Use Assets, Net Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Lien Category [Domain] Lien Category [Domain] Income tax expense/(benefit) Income tax expense/(benefit) Income Tax Expense (Benefit) Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability Prepayments and other current assets Business Combination, Recognized Asset Acquired, Prepaids And Other Assets, Current Business Combination, Recognized Asset Acquired, Prepaids And Other Assets, Current Long-term debt and finance leases Business Combination, Recognized Liability Assumed, Long-Term Debt and Finance Leases, Noncurrent Business Combination, Recognized Liability Assumed, Long-Term Debt and Finance Leases, Noncurrent Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Statement [Table] Statement [Table] Treasury Lock Treasury Lock [Member] Derivative contracts, excluding NPNS elected Derivative Liability, Excluding NPNS Elected, Subject to Master Netting Arrangement, before Offset Derivative Liability, Excluding NPNS Elected, Subject to Master Netting Arrangement, before Offset Other revenue Products And Services, Other [Member] Products And Services, Other [Member] Counterparty Risk by Institution [Domain] Counterparty Risk by Institution [Domain] Represents the counter party risk exposure by institutions involved. Capped calls, strike price (in usd per share) Capped Call Options, Strike Price Capped Call Options, Strike Price Schedule of Contract Asset and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derivative contracts Derivative assets Derivative Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Interest Interest-Earning Asset and Interest-Bearing Liability, Interest, Change in Volume [Member] Schedule of Measurement Period Adjustments Business Combination, Pro Forma Information, Nonrecurring Adjustment [Table Text Block] Contract Cost Fulfillment Contract Cost Fulfillment [Member] Contract Cost Fulfillment Equity Compensation Instruments Share-Based Payment Arrangement [Member] Schedule of Contract Assets and Liabilities [Line Items] Schedule Of Contract Assets And Liabilities [Line Items] [Line Items] for Schedule Of Contract Assets And Liabilities [Table] Unrealized mark-to-market results Unrealized Mark To Market Results [Abstract] -- None. No documentation exists for this element. -- Retirement of treasury stock (in shares) Retirement of treasury stock (in shares) Treasury Stock, Shares, Retired Natural Gas Contracts Natural Gas Contracts [Member] Natural Gas Contracts Beginning balance Ending balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Recoveries collected Accounts Receivable, Allowance for Credit Loss, Recovery Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]