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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 401 | $ 402 |
Deferred Tax Assets, Valuation Allowances | 906 | 834 |
Tax Cuts And Jobs Act [Member] |  |  |
Credit carryforwards |  |  |
Permanently reinvested cumulative undistributed foreign earnings | 8,000 |  |
Investment Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 134 |  |
Credit Carryforward Valuation Allowance Investment Tax Credit | 0 |  |
Foreign Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 218 |  |
Credit Carryforward Valuation Allowance Foreign Tax Credits | (113) |  |
Foreign Tax Credit [Member] | Federal [Member] | Tax Year 2016 [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Credit carryforwards |  |  |
Deferred Tax Assets, Foreign Tax Credit Carryforwards | 62 |  |
Foreign Tax Credit [Member] | Federal [Member] | Tax Year 2017 [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Credit carryforwards |  |  |
Deferred Tax Assets, Foreign Tax Credit Carryforwards | 156 |  |
Recycling Tax Credit [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 16 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 32 |  |
Credit Carryforward Valuation Allowance Other | (4) |  |
Other [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset 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 | 834 | 808 | $ 838
Additions charged to income | 69 | 31 | 26
Additions charged to other accounts | 7 | 0 | 0
Deductions | 4 | 5 | 56
Balance at end of period | 906 | 834 | 808
Decrease of the valuation allowance as a result of a change in foreign tax credits available |  |  | 35
Decrease of the valuation allowance as a result of the change in currency exchange rates | 11 |  | 19
Increase of the valuation allowance as a result of the reduction in the U.S. federal corporate income tax rate | 38 |  |
PPL Electric Utilities Corp [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 5 |  |
LG And E And KU Energy LLC [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 17 | 19 |
Deferred tax asset credit carryforwards | 159 | 162 |
Deferred Tax Assets, Valuation Allowances | 4 | 6 |
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 134 |  |
Credit Carryforward Valuation Allowance Investment Tax Credit | 0 |  |
LG And E And KU Energy LLC [Member] | Recycling Tax Credit [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 16 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 25 |  |
Credit Carryforward Valuation Allowance Other | (4) |  |
LG And E And KU Energy LLC [Member] | Other [Member] | State [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 1 |  |
Credit Carryforward Valuation Allowance Other | 0 |  |
LG And E And KU Energy LLC [Member] | Valuation Allowance Of Deferred Tax Assets [Member] |  |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Balance at beginning of period | 6 | 8 | 8
Additions charged to other accounts | 0 | 3 | 0
Deductions | 2 | 5 | 0
Balance at end of period | 4 | 6 | $ 8
Louisville Gas And Electric Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 12 | 14 |
Deferred Tax Assets, Valuation Allowances | 12 | 14 |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 12 |  |
Deferred Tax Assets, Valuation Allowances | 12 |  |
Kentucky Utilities Co [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 5 | 5 |
Deferred Tax Assets, Valuation Allowances | 4 | $ 4 |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 5 |  |
Deferred Tax Assets, Valuation Allowances | 4 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Tax Credit Carryforward Expiration Year 2028 [Member] |  |  |
Credit carryforwards |  |  |
State tax credit carryforwards | 4 |  |
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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