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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Credit carryforwards |  |  |
Deferred tax asset tax credit carryforwards | $ 15 | $ 401 |
Deferred Tax Assets, Valuation Allowances | 462 | 536 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 462 | 536 |
Recycling Tax Credit [Member] | State [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 | 1 |  |
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 | 536 | 514 | $ 495
Additions charged to income | 48 | 26 | 24
Additions charged to other accounts | 0 | 0 | 0
Deductions | 122 | 4 | 5
Balance at end of period | 462 | 536 | $ 514
SEC Schedule 12-09, Valuation Allowance, Deduction, Business Disposition | 113 |  |
Louisville Gas And Electric Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 11 | 12 |
Deferred Tax Assets, Valuation Allowances | 11 | 12 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 11 | 12 |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 11 |  |
Deferred Tax Assets, Valuation Allowances | 11 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 11 |  |
Kentucky Utilities Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 4 | 5 |
Deferred Tax Assets, Valuation Allowances | 3 | 4 |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 3 | $ 4 |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 4 |  |
Deferred Tax Assets, Valuation Allowances | 3 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Deferred Tax Assets, Valuation Allowances | 3 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 3 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Indefinite [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | $ 1 |  |

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