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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 392 | $ 455 |
Tax Cuts And Jobs Act [Member] |  |  |
Credit carryforwards |  |  |
Credit Carryforward Valuation Allowance Foreign Tax Credits |  | 122 |
Taxable Deemed Dividend |  | 462 |
Deferred Tax Assets, Foreign Tax Credit Carryforwards |  | 205 |
Permanently reinvested cumulative undistributed foreign earnings | 6,700 |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Increase of the valuation allowance as a result of the expected future utilization of foreign tax credits |  | 145 |
Investment Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 133 |  |
Credit Carryforward Valuation Allowance Investment Tax Credit | $ 0 |  |
Investment Tax Credit [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2025 |  |
Investment Tax Credit [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2036 |  |
Alternative Minimum Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 15 |  |
Credit Carryforward Valuation Allowance Alternative Minimum 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 |  |
Foreign Tax Credit [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2024 |  |
Foreign Tax Credit [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2027 |  |
Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 25 |  |
Credit Carryforward Valuation Allowance Other | $ (8) |  |
Other [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2019 |  |
Other [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2038 |  |
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 | 838 | 593 | $ 662
Additions charged to income | 26 | 256 | 17
Additions charged to other accounts | 0 | 0 | 2
Deductions | 56 | 11 | 88
Balance at end of period | 808 | 838 | 593
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 | 19 |  | 65
Increase of the valuation allowance as a result of the expected future utilization of foreign tax credits |  | 145 |
Increase of the valuation allowance as a result of the reduction in the U.S. federal corporate income tax rate |  | 62 |
Reduction of the valuation allowance as a result of the reduction in the UK statutory income tax rate |  |  | 19
LG And E And KU Energy LLC [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 169 | 181 |
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 133 |  |
Credit Carryforward Valuation Allowance Investment Tax Credit | $ 0 |  |
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2025 |  |
LG And E And KU Energy LLC [Member] | Investment Tax Credit [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2036 |  |
LG And E And KU Energy LLC [Member] | Alternative Minimum Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 14 |  |
Credit Carryforward Valuation Allowance Alternative Minimum Tax Credit | 0 |  |
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 22 |  |
Credit Carryforward Valuation Allowance Other | $ (8) |  |
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2019 |  |
LG And E And KU Energy LLC [Member] | Other [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2038 |  |
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 | 8 | 11 | 12
Additions charged to other accounts | 0 | 4 | 0
Deductions | 0 | 7 | 1
Balance at end of period | 8 | $ 8 | $ 11
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 6 |  |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2036 |  |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2038 |  |

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