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Air [Member] Environmental Matters, Air Earnings Per Share Earnings Per Share [Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event Subsequent Event [Member] Schedule of Asset Retirement Obligations Schedule of Asset Retirement Obligations [Table Text Block] Inventory [Axis] Inventory [Axis] Restricted cash and cash equivalents (Note 16) Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Subsidiary, TES Subsidiaries [Member] NDT funds (gain) loss, net (excluding interest and fees) Gain (Loss) on Investments Financing proceeds at Emergence, net of discount Proceeds From Exit Financings, Net Proceeds From Exit Financings, Net Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Segments [Domain] Segments [Domain] Income tax benefit (expense) Other 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members Loss Contingency, Number Of Former Retirement Plan Committee Members Loss Contingency, Number Of Former Retirement Plan Committee Members Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Disposal Group Name [Axis] Disposal Group Name [Axis] Debt securities, Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] 2024 Long-Term Debt, Maturity, Remainder of Fiscal Year Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Operating activities reconciliation adjustments, other: Operating Activities Reconciliation Adjustments [Abstract] Operating Activities Reconciliation Adjustments Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Other Other Operating Segment [Member] Other permanent differences Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Assets Assets, Fair Value Disclosure [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Cash equivalents, Fair Value Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Non-cash decrease to PP&E and decrease to noncontrolling interest for transfer of miners to TeraWulf Non-cash Decrease To Property, Plant And Equipment And Decrease To Noncontrolling Interest For Transfer Of Cryptocurrency Miners Non-cash Decrease To Property, Plant And Equipment And Decrease To Noncontrolling Interest For Transfer Of Cryptocurrency Miners Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Surety bonds Guarantor Obligations, Current Carrying Value Equity investments in affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Unrealized gain (loss) on derivative instruments Commodity Contracts, Unrealized Gain (Loss) [Member] Commodity Contracts, Unrealized Gain (Loss) Deferred income taxes (Note 5) Deferred Income Tax Liabilities, Net Fair Value Debt Instrument, Fair Value Disclosure [Abstract] Postemployment Benefits [Abstract] Shares repurchased, tender offer (in shares) Treasury Stock, Shares, Acquired, Tender Offer Treasury Stock, Shares, Acquired, Tender Offer Property, Plant, and Equipment, Brandon Shores Property, Plant, And Equipment, Brandon Shores [Member] Property, Plant, And Equipment, Brandon Shores Other assets Increase (Decrease) in Other Operating Assets Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Less: other Liabilities, Other, Fair Value Disclosure Liabilities, Other, Fair Value Disclosure PEO Total Compensation Amount PEO Total Compensation Amount Liabilities, Gross Derivative Instruments Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity securities, Amortized Cost Equity Securities, FV-NI, Cost Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Aggregate credit exposure Credit Derivative, Maximum Exposure, Undiscounted Accrued interest Interest Payable, Current Other Other Depreciation And Amortization, Decrease 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Growth Company Total liabilities Liabilities, Fair Value Disclosure Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Electric generation Electricity, Generation [Member] Short Short [Member] Allowable decrease to power grid Allowable Decrease To Power Grid Allowable Decrease To Power Grid Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Reclassification to Consolidated Statements of Operations Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Stockholders' Equity Equity [Text Block] Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Segments Segment Reporting Disclosure [Text Block] Long-term debt, due within one year (Notes 11 and 12) Less: long-term debt, due within one year Long-Term Debt, Current Maturities Assets, Net Amounts Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction Postretirement benefit actuarial gain (loss), net Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Bilateral LCF Bilateral LCF [Member] Bilateral LCF Reduction in interest rate Debt Instrument, Interest Rate, Increase (Decrease) Non-cash reconciliation adjustments: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Percentage of common stock purchased Common Stock Purchased, Percentage Of Total Outstanding Common Stock Purchased, Percentage Of Total Outstanding Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Reclassifications from AOCI, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Consolidated Entities [Axis] Consolidated Entities [Axis] Statement [Table] Statement [Table] Counterparty Name [Axis] Counterparty Name [Axis] Less: Comprehensive income (loss) attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Consolidation Items [Domain] Consolidation Items [Domain] Position [Domain] Position [Domain] City Area Code City Area Code Assets, Net Derivative Instruments Derivative Asset, Subject to Master Netting Arrangement, after Offset Interest and other finance charges, net of capitalized interest Interest Paid, Excluding Capitalized Interest, Operating Activities Bonds Bonds [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Interest rate, floor Debt Instrument, Basis Spread On Variable Rate, Floor Debt Instrument, Basis Spread On Variable Rate, Floor (Gain) loss on Cumulus Data Campus Sale and ERCOT Sale Gain (loss) on sale of assets, net Gain (Loss) on Disposition of Assets Total current assets Assets, Current Statement of Cash Flows [Abstract] Non-cash financing/investing activities Noncash Investing and Financing Items [Abstract] Surety Bond Surety Bond [Member] Unused Capacity Line of Credit Facility, Remaining Borrowing Capacity Share repurchases (Note 15) Payments for Repurchase of Common Stock 2027 Long-Term Debt, Maturity, Year Three Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Long-term debt (Notes 11 and 12) Long-term debt Long-Term Debt, Excluding Current Maturities Available-for-sale securities unrealized (gain) loss, net Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Income Taxes Income Tax Disclosure [Text Block] Basis of Presentation and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Earnings Per Share [Abstract] Asset retirement obligations and accrued environmental costs (Note 9) Asset retirement obligations and accrued environmental costs due after one year Asset Retirement Obligation And Accrued Environmental Costs, Noncurrent Asset Retirement Obligation And Accrued Environmental Costs, Noncurrent Equity [Abstract] Accumulated retained earnings (deficit) Retained Earnings (Accumulated Deficit) Long Long [Member] Inventory, net Increase (Decrease) in Inventories Shares retired (in shares) Treasury Stock, Shares, Retired Supplemental Cash Flow Elements [Abstract] General and administrative General and Administrative Expense Margin Deposits Margin Deposits [Member] Margin Deposits 2026 Long-Term Debt, Maturity, Year Two Amount awarded Litigation Settlement, Amount Awarded to Other Party Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Number of auctions Number Of Auctions Number Of Auctions Equity Awards Adjustments Equity Awards Adjustments [Member] Maturities thereafter Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, After Year Five Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, After Year Five Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Performance stock units Performance Shares [Member] Payment of make-whole premiums on Prepetition Secured Indebtedness Payment for Debt Extinguishment or Debt Prepayment Cost Power generating capacity Power Generating Capacity Of Electric Generation Portfolio Power Generating Capacity Of Electric Generation Portfolio Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Long-term debt Long-Term Debt, Fair Value Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Warrants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Environmental Matters, Water And Waste Environmental Matters, Water And Waste [Member] Environmental Matters, Water And Waste Fair Value as of Grant Date Award Grant Date Fair Value Production tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Amount Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Level 2 Fair Value, Inputs, Level 2 [Member] Maturities within one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Stockholders’ Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Liabilities, Net Amounts Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Summary of Disaggregation of Operating Revenues Disaggregation of Revenue [Table Text Block] Issuance of member's equity Stock Issued During Period, Value, New Issues Nuclear fuel amortization Nuclear fuel amortization Amortization of Nuclear Fuel Derivative instruments (Notes 3 and 12) Derivative liability, noncurrent Derivative Liability, Noncurrent Nuclear insurance, liability limit per accident Nuclear Insurance, Liability Limit Per Accident Nuclear Insurance, Liability Limit Per Accident Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Principles of Consolidation Consolidation, Policy [Policy Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Cumulus Data Campus Sale Cumulus Data Campus [Member] Cumulus Data Campus Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common stock ($0.001 par value 350,000,000 shares authorized) Common Stock, Value, Issued Number of former members, equity units acquired Number Of Former Members, Equity Units Acquired Number Of Former Members, Equity Units Acquired Non-cash increase to PP&E and decrease to other current assets for transfer of miners by Cumulus Coin Non-cash Increase To Property, Plant And Equipment And Decrease To Other Current Assets For Transfer Of Cryptocurrency Miners Non-cash Increase To Property, Plant And Equipment And Decrease To Other Current Assets For Transfer Of Cryptocurrency Miners Asset retirement obligations Carrying value, December 31, 2023 (Successor) Carrying value, June 30, 2024 (Successor) Asset Retirement Obligation Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds Nuclear Decommissioning Trust Funds [Table Text Block] Nuclear Decommissioning Trust Funds Proceeds from the sale of assets Proceeds from Sale of Other Assets, Investing Activities Number of mine permits amended Number Of Mine Permits Amended Number Of Mine Permits Amended Cash and cash equivalents Cash equivalents, Amortized Cost Cash and Cash Equivalents, at Carrying Value Derivative assets, netting Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Nuclear decommissioning trust taxes Effective Income Tax Rate Reconciliation, Nuclear Decommissioning Trust, Amount Effective Income Tax Rate Reconciliation, Nuclear Decommissioning Trust, Amount Gains (losses) arising during the period Other Comprehensive Income (Loss), before Reclassifications, before Tax Litigation Status [Axis] Litigation Status [Axis] Other investing activities Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Income tax benefit (expense) Reclassification from AOCI, Current Period, Tax Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] LMBE-MC TLB payments Repayment Of Term Loan Repayment Of Term Loan Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] 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] TeraWulf TeraWulf [Member] TeraWulf State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Maximum power sold and provided Maximum Power, Sold And Provided Maximum Power, Sold And Provided Estimated Useful Life (years) Property, Plant and Equipment, Useful Life Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Depreciation, amortization and accretion Depreciation, amortization, and accretion Depreciation, amortization and accretion Depreciation, Depletion and Amortization, Nonproduction Net Income (Loss) Attributable to Stockholders - Basic (in dollars per share) Earnings per Share - Basic (in dollars per share) Earnings Per Share, Basic Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Number Of FERC filings Number Of FERC Filings Number Of Filings Concentration of Credit or Market Risk [Axis] Concentration of Credit or Market Risk [Axis] Ownership [Domain] Ownership [Domain] Additional surety bonds Guarantor Obligations, Additional Amount Guarantor Obligations, Additional Amount Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Amortization expense Amortization Net Income (Loss) Attributable to Stockholders (Successor) / Member (Predecessor) Net Income (Loss) Available to Common Stockholders, Basic Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Number of cases dismissed Loss Contingency, Claims Dismissed, Number Summary of Available-for-Sale Debt Securities with Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Finite-Lived Intangible Assets Finite-Lived Intangible Assets, Net [Abstract] Total current liabilities Liabilities, 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] Denominator: (Thousands) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total Assets Assets Additional days Extension, Number Of Days Extension, Number Of Days LCs Issued Long-Term Line of Credit Non-cash contributions Noncontrolling Interest, Increase from Subsidiary Equity Issuance Property, plant and equipment expenditures Payments to Acquire Property, Plant, and Equipment Other noncurrent liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Commitments and Contingencies (Note 10) Commitments and Contingencies Liabilities, Eligible for Offset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Interest expense and other finance charges Interest expense and other finance charges Interest expense and other finance charges Interest and Debt Expense Maximum insurance converge, nuclear Insurance Maximum Coverage, Property Damage Losses, Nuclear Insurance Maximum Coverage, Property Damage Losses, Nuclear Ten Largest Single Net Credit Exposures Account Ten Largest Single Net Credit Exposures [Member] Ten Largest Single Net Credit Exposures Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Energy [Domain] Energy [Domain] 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] Operating revenues Operating revenues Revenues 2025 Long-Term Debt, Maturity, Year One Nuclear fuel expenditures Payments for Nuclear Fuel Cumulus Digital Holdings Cumulus Digital Holdings [Member] Cumulus Digital Holdings Entity Address, City or Town Entity Address, City or Town Equity securities, Unrealized Gains Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, Before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, Before Tax Unrealized Losses Decommissioning Fund Investments, Accumulated Gross Unrealized Loss, Before Tax Decommissioning Fund Investments, Accumulated Gross Unrealized Loss, Before Tax Debt Instrument [Axis] Debt Instrument [Axis] Summary of Carrying Value and Fair Value of Indebtedness Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Assets, Collateral (Posted) Received Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Assets, Eligible for Offset Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Net Income (Loss) Net Income (Loss) Attributable to Parent Stock-based compensation expense Share-Based Payment Arrangement, Expense Other operating income (expense), net Other Operating Income (Expense), Net Trading Arrangement: Trading Arrangement [Axis] Summary of Recurring Fair Value Measurements Fair Value, by Balance Sheet Grouping [Table Text Block] Investments, Debt and Equity Securities [Abstract] Other Commitments [Table] Other Commitments [Table] Energy Expenses Energy Expenses Energy Expenses Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Effect of Netting, Offsetting Assets Offsetting Assets [Table Text Block] Committed Capacity Line of Credit Facility, Current Borrowing Capacity Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Finite-Lived Assets Property, Plant and Equipment, Net [Abstract] Escrow deposit Escrow Deposit 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] Entity File Number Entity File Number Fixed-price power commitment increase Long-Term Contract For Purchase Of Electric Power, Power Commitment Increase Long-Term Contract For Purchase Of Electric Power, Power Commitment Increase Materials and supplies, net Inventory, Parts and Components, Net of Reserves Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Summary of Maturities for Available-for-sale Debt Securities Realized Gain (Loss) on Investments [Table Text Block] Non-cash investing and operating activities Noncash Investing And Operating Activities [Abstract] Noncash Investing And Operating Activities Liabilities Liabilities, Fair Value Disclosure [Abstract] Secured ISDAs Secured ISDAs [Member] Secured ISDAs Realized gain (loss) on commodity contracts Gain (Loss) on Sale of Commodity Contracts Consolidated Entities [Domain] Consolidated Entities [Domain] Revenue Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Non controlling Interest Noncontrolling Interest [Member] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Asset Retirement Obligation [Line Items] Asset Retirement Obligation [Line Items] Asset Retirement Obligation [Line Items] Letters of credit terminated Extinguishment of Debt, Amount Share repurchase Share repurchase Treasury Stock, Value, Acquired, Cost Method Postretirement benefit obligations (Note 13) Postemployment Benefits Liability, Noncurrent Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total assets Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Other Total Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Insider Trading Arrangements [Line Items] Inventory Disclosure [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Texas Third Court Of Appeals Texas Third Court Of Appeals [Member] Texas Third Court Of Appeals Retirement of treasury stock Treasury stock retired, value Treasury Stock, Retired, Cost Method, Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Restricted Deposits Restricted Deposits [Member] Restricted Deposits Equity securities, Unrealized Losses Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax Adjustment to Compensation: Adjustment to Compensation [Axis] Less: Net income (loss) attributable to noncontrolling interest Net income (loss) attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Brandon Shores Inventory Brandon Shores Inventory [Member] Brandon Shores Inventory Maturities within two to five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Total asset retirement obligations and accrued environmental costs Asset Retirement Obligation And Accrued Environmental Costs Asset Retirement Obligation And Accrued Environmental Costs Litigation Case [Domain] Litigation Case [Domain] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Accumulated earnings (deficit) Retained Earnings [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Litigation Status [Domain] Litigation Status [Domain] Other property and equipment Property, Plant and Equipment, Other Types [Member] Electricity sales and ancillary services, ISO/RTO Electricity Sales And Ancillary Services [Member] Electricity Sales And Ancillary Services Operating Revenues Operating Revenues [Member] Operating Revenues Contributions from member Proceeds from Contributions from Affiliates Number of subsidiaries Number Of Subsidiaries That Filed For Bankruptcy Number Of Subsidiaries That Filed For Bankruptcy Weighted-Average Number of Common Shares Outstanding - Basic (in shares) Weighted-average shares outstanding - Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Income tax benefit (expense) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Maximum power supply commitment Long-Term Contract For Purchase Of Electric Power, Maximum Power Supply Commitment Long-Term Contract For Purchase Of Electric Power, Maximum Power Supply Commitment Fuel and energy purchases Operating Expense, Fuel Used And Purchased Power Operating Expense, Fuel Used And Purchased Power Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Unrealized Gains Decommissioning Fund Investments, Accumulated Gross Unrealized Gain, Before Tax Decommissioning Fund Investments, Accumulated Gross Unrealized Gain, Before Tax Unrealized Losses, One Year or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Proceeds from Cumulus Data Campus Sale and ERCOT Sale (Note 17) Proceeds from divestiture Proceeds from Sale of Productive Assets Total Equity Beginning balance Ending balance Total Equity Equity, Including Portion Attributable to Noncontrolling Interest Amortization of deferred finance costs and original issuance discounts (interest expense) Amortization of Debt Issuance Costs and Discounts Restricted stock units Restricted Stock Units (RSUs) [Member] Treasury Stock and Retirement of Treasury Shares Stockholders' Equity, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Construction work in progress Construction in Progress [Member] Receivables (payables), net, Amortized Cost Receivables (Payables), Net, Amortized Cost Receivables (Payables), Net, Amortized Cost Entity Filer Category Entity Filer Category Expected capacity revenues Revenue, Remaining Performance Obligation, Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Letter of Credit Letter of Credit [Member] Company Selected Measure Name Company Selected Measure Name Talen Energy Supply, LLC Talen Energy Supply, LLC [Member] Talen Energy Supply, LLC