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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | $ 24 | $ 67 |
Deferred Tax Assets, Valuation Allowances | 224 | 245 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 224 | 245 |
SEC Schedule 12-09, Valuation Allowance, Deduction, Tax Rate Change |  |  | $ 213
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward | 23 | 22 | 36
Recycling Tax Credit [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 8 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 14 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
Other [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 2 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Balance at beginning of period | 245 | 213 | 462
Additions charged to income | 3 | 54 | 10
Additions charged to other accounts | 1 | 0 | 0
Deductions | 25 | 22 | 259
Balance at end of period | 224 | 245 | $ 213
Louisville Gas And Electric Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 6 | 8 |
Deferred Tax Assets, Valuation Allowances | 6 | 8 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 6 | 8 |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 6 |  |
Deferred Tax Assets, Valuation Allowances | 6 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 6 |  |
Kentucky Utilities Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 4 | 4 |
Deferred Tax Assets, Valuation Allowances | 2 | 2 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 2 | $ 2 |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 4 |  |
Deferred Tax Assets, Valuation Allowances | 2 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 2 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 2 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | $ 2 |  |

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