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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 186 | $ 231
Federal statutory tax rate | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | $ 13 | $ 13
Valuation allowance adjustments | 5 | 6
Impact of lower U.K. income tax rates | (48) | (54)
U.S. income tax on foreign earnings - net of foreign tax credit | (9) | (2)
Impact of the U.K. Finance Acts | (3) | 0
Depreciation not normalized | (3) | (1)
Interest benefit on U.K. financing entities | (4) | (5)
Stock-based compensation | (3) | (8)
Other | (5) | (1)
Total increase (decrease) | (57) | (52)
Total income taxes | 129 | 179
PPL Electric Utilities Corp [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 44 | $ 53
Federal statutory tax rate | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | $ 8 | $ 9
Depreciation not normalized | (2) | (1)
Stock-based compensation | (2) | (5)
Other |  |
Total increase (decrease) | 4 | 3
Total income taxes | 48 | 56
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 - 35% | $ 58 | $ 67
Federal statutory tax rate | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | $ 6 | $ 7
Other | (1) | (2)
Total increase (decrease) | 5 | 5
Total income taxes | 63 | 72
Louisville Gas And Electric Co [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 30 | $ 32
Federal statutory tax rate | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | $ 3 | $ 3
Total increase (decrease) | 3 | 3
Total income taxes | 33 | 35
Kentucky Utilities Co [Member] |  |
Reconciliation of Income Tax Expense [Abstract] |  |
Federal income tax on Income Before Income Taxes at statutory tax rate - 35% | $ 36 | $ 42
Federal statutory tax rate | 35.00% | 35.00%
Increase (decrease) due to: [Abstract] |  |
State income taxes, net of federal income tax benefit | $ 4 | $ 4
Other | (1) | 0
Total increase (decrease) | 3 | 4
Total income taxes | $ 39 | $ 46

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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the state regulatory treatment of depreciation-related timing differences. + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed attributable to changes in the amount of foreign income tax benefits related to interest expense on intercompany loans for which there was no domestic income tax expense. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References No definition available. + Details
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