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Income Taxes (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 13, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | $ (64) | $ 17
Reconciliation of Income Tax Expense [Abstract] |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate |  | 119 | 186
Increase (decrease) due to: [Abstract] |  |  |
State income taxes, net of federal income tax benefit |  | 15 | 13
Valuation allowance adjustments |  | 7 | 5
Impact of lower U.K. income tax rates relative to U.S. income tax rates |  | (7) | (48)
U.S. income tax on foreign earnings - net of foreign tax credit |  | 1 | (9)
Impact of the U.K. Finance Acts |  | (1) | (3)
Depreciation and other items not normalized |  | (12) | (3)
Interest benefit on U.K. financing entities |  | (5) | (4)
Stock-based compensation |  | 1 | (3)
Other |  | (1) | (5)
Total increase (decrease) |  | (2) | (57)
Total income taxes |  | 117 | 129
LKE [Member] | Tax Cuts And Jobs Act [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | $ 9 |  |
LGE [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 16 |  |
KU [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 19 |  |
PPL Electric Utilities Corp [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | (5) | 11
Reconciliation of Income Tax Expense [Abstract] |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate |  | 41 | 44
Increase (decrease) due to: [Abstract] |  |  |
State income taxes, net of federal income tax benefit |  | 15 | 8
Depreciation and other items not normalized |  | (7) | (2)
Stock-based compensation |  | 0 | (2)
Other |  | 0 | 0
Total increase (decrease) |  | 8 | 4
Total income taxes |  | 49 | 48
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 |  | 38 | 58
Increase (decrease) due to: [Abstract] |  |  |
State income taxes, net of federal income tax benefit |  | 8 | 6
Amortization of investment tax credit |  | 0 | 0
Depreciation and other items not normalized |  | (5) | 0
Stock-based compensation |  | 0 | 0
Other |  | (2) | (1)
Total increase (decrease) |  | 1 | 5
Total income taxes |  | 39 | 63
LG And E And KU Energy LLC [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 9 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 16 |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 19 |  |
Louisville Gas And Electric Co [Member] |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate |  | 20 | 30
Increase (decrease) due to: [Abstract] |  |  |
State income taxes, net of federal income tax benefit |  | 4 | 3
Depreciation and other items not normalized |  | (2) | 0
Other |  | (1) | 0
Total increase (decrease) |  | 1 | 3
Total income taxes |  | 21 | 33
Louisville Gas And Electric Co [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 16 |  |
Kentucky Utilities Co [Member] |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate |  | 23 | 36
Increase (decrease) due to: [Abstract] |  |  |
State income taxes, net of federal income tax benefit |  | 5 | 4
Depreciation and other items not normalized |  | (3) | 0
Other |  | (1) | (1)
Total increase (decrease) |  | 1 | 3
Total income taxes |  | $ 24 | $ 39
Kentucky Utilities Co [Member] | Kentucky tax reform [Member] | Subsequent Event [Member] |  |  |
Income Taxes [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 19 |  |

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