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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ 88 | $ 110 | $ 234 | $ 235
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 11 | 8 | 24 | 21
Valuation allowance adjustments | 7 | 7 | 13 | 14
Impact of lower U.K. income tax rates relative to U.S. income tax rates | (9) | (6) | (20) | (14)
Amortization of excess deferred income taxes | (12) | (10) | (23) | (21)
Interest benefit on U.K. financing entities | (3) | (3) | (5) | (6)
Kentucky recycling credit, net of federal income tax expense | 0 | (20) | 0 | (20)
Other | (8) | (2) | (9) | 1
Total increase (decrease) | (14) | (26) | (20) | (25)
Total income tax expense (benefit) | 74 | 84 | 214 | 210
Minimum [Member] |  |  |  |
Increase (decrease) due to: [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | 100 |
Maximum [Member] |  |  |  |
Increase (decrease) due to: [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | 110 |
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 33 | 26 | 67 | 61
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 12 | 10 | 25 | 23
Depreciation and other items not normalized | (2) | (1) | (4) | (3)
Amortization of excess deferred income taxes | (5) | (4) | (8) | (8)
Other | 2 | 1 | 1 | 1
Total increase (decrease) | 7 | 6 | 14 | 13
Total income tax expense (benefit) | 40 | 32 | 81 | 74
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 | 21 | 23 | 56 | 56
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 4 | 4 | 11 | 10
Valuation allowance adjustments | 0 | 3 | 0 | 3
Amortization of excess deferred income taxes | (6) | (6) | (13) | (12)
Kentucky recycling credit, net of federal income tax expense | 0 | (20) | 0 | (20)
Other | (2) | (1) | (3) | (2)
Total increase (decrease) | (4) | (20) | (5) | (21)
Total income tax expense (benefit) | 17 | 3 | 51 | 35
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 12 | 12 | 32 | 29
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 2 | 2 | 6 | 5
Valuation allowance adjustments | 0 | 15 | 0 | 15
Amortization of excess deferred income taxes | (2) | (2) | (5) | (5)
Kentucky recycling credit, net of federal income tax expense | 0 | (15) | 0 | (15)
Other | 0 | 0 | (2) | 0
Total increase (decrease) | 0 | 0 | (1) | 0
Total income tax expense (benefit) | 12 | 12 | 31 | 29
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 13 | 16 | 34 | 37
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 3 | 3 | 6 | 7
Valuation allowance adjustments | 0 | 5 | 0 | 5
Amortization of excess deferred income taxes | (4) | (4) | (8) | (7)
Kentucky recycling credit, net of federal income tax expense | 0 | (5) | 0 | (5)
Other | (1) | (1) | (1) | (1)
Total increase (decrease) | (2) | (2) | (3) | (1)
Total income tax expense (benefit) | $ 11 | $ 14 | $ 31 | $ 36

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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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