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Income and Other Taxes (Credit Carryforwards and Valuation Allowances and Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 455 | $ 256 |
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 | 6,000 |  |
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 |  |
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |
Valuation Allowances and Reserves (Details) [Roll Forward] |  |  |
Balance at beginning of period | 593 | 662 | $ 622
Additions charged to income | 256 | 17 | 24
Additions charged to other accounts | 0 | 2 | 77
Deductions | 11 | 88 | 61
Balance at end of period | 838 | 593 | 662
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) | (44)
Valuation Rollforward Specific Transaction Deductions Exchange Rates |  | 65 |
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 |  |
Foreign Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 267 |  |
Credit Carryforward Valuation Allowance Foreign Tax Credits | (148) |  |
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 | $ 205 |  |
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 |  |
Alternative Minimum Tax Credit [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | $ 30 |  |
Credit Carryforward Valuation Allowance Alternative Minimum Tax Credit | 0 |  |
Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 24 |  |
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, 2037 |  |
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] |  |  |
Credit carryforwards |  |  |
Deferred tax asset credit carryforwards | 181 | 186 |
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 | 11 | 12 | 0
Additions charged to other accounts | 4 | 0 | 12
Deductions | 7 | 1 | 0
Balance at end of period | 8 | $ 11 | $ 12
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 | $ 27 |  |
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 | 21 |  |
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, 2037 |  |
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 |  |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward, Amount | $ 6 |  |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2034 |  |
Louisville Gas And Electric Co [Member] | Other [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2037 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward, Amount | $ 6 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Minimum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2034 |  |
Kentucky Utilities Co [Member] | Other [Member] | Federal [Member] | Maximum [Member] |  |  |
Credit carryforwards |  |  |
Tax Credit Carryforward Expiration Date 1 | Dec. 31, 2037 |  |

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