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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ 124 | $ 119
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | 13 | 15
Valuation allowance adjustments | 7 | 7
Impact of lower U.K. income tax rates relative to U.S. income tax rates | (8) | (7)
Amortization of excess deferred income taxes | (11) | (10)
Other | 1 | (7)
Total increase (decrease) | 2 | (2)
Total income taxes | 126 | 117
PPL Electric Utilities Corp [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 34 | 41
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | 13 | 15
Amortization of excess deferred income taxes | (4) | (5)
Other | (1) | (2)
Total increase (decrease) | 8 | 8
Total income taxes | 42 | 49
LG And E And KU Energy LLC [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 33 | 38
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | 6 | 8
Amortization of excess deferred income taxes | (6) | (5)
Other | (1) | (2)
Total increase (decrease) | (1) | 1
Total income taxes | 32 | 39
Louisville Gas And Electric Co [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 17 | 20
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | 3 | 4
Amortization of excess deferred income taxes | (3) | (2)
Other | 0 | (1)
Total increase (decrease) | 0 | 1
Total income taxes | 17 | 21
Kentucky Utilities Co [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 22 | 23
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | 4 | 5
Amortization of excess deferred income taxes | (3) | (3)
Other | (1) | (1)
Total increase (decrease) | 0 | 1
Total income taxes | $ 22 | $ 24

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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the current period and the expected income tax expense (benefit) computed attributable to the amortization of excess deferred income taxes due to a change in the federal corporate income tax rate. + References No definition available. + Details
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