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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | $ 35 | $ 24 |
Deferred Tax Assets, Valuation Allowances | 184 | 224 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 184 | 224 |
SEC Schedule 12-09, Valuation Allowance, Deduction, Expiration of NOL Carryforward | 41 | 23 | $ 22
Investment Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 26 |  |
Credit Carryforward Valuation Allowance Investment Tax Credit | 0 |  |
Recycling Tax Credit [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 6 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | 2 |  |
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 | 224 | 245 | 213
Additions charged to income | 4 | 3 | 54
Additions charged to other accounts | 0 | 1 | 0
Deductions | 44 | 25 | 22
Balance at end of period | 184 | 224 | $ 245
Louisville Gas And Electric Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 5 | 6 |
Deferred Tax Assets, Valuation Allowances | 5 | 6 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 5 | 6 |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 5 |  |
Deferred Tax Assets, Valuation Allowances | 5 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 5 |  |
Kentucky Utilities Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 3 | 4 |
Deferred Tax Assets, Valuation Allowances | 1 | 2 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 1 | $ 2 |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 3 |  |
Deferred Tax Assets, Valuation Allowances | 1 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 1 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 1 |  |
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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