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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ 103 | $ 125 | $ 336 | $ 359
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 15 | 13 | 39 | 34
Depreciation and other items not normalized | 0 | (2) | (4) | (5)
Valuation allowance adjustments | 7 | 7 | 20 | 21
Impact of lower U.K. income tax rates relative to U.S. income tax rates | 2 | (6) | (18) | (20)
Amortization of excess deferred income taxes | (11) | (9) | (34) | (30)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | (9) | 0 | (9) | 1
Interest benefit on U.K. financing entities | (3) | (3) | (8) | (9)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | 1 | 0 | 5 | 2
Kentucky recycling credit, net of federal income tax expense | 0 | 0 | 0 | (20)
Other | 0 | (2) | (5) | 3
Total increase (decrease) | 106 | (7) | 87 | (31)
Total income tax expense (benefit) | 209 | 118 | 423 | 328
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 104 | (5) | 101 | (8)
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 37 | 33 | 104 | 94
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 14 | 13 | 39 | 36
Depreciation and other items not normalized | 0 | (2) | (4) | (5)
Amortization of excess deferred income taxes | (4) | (4) | (12) | (12)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | (4) | 0 | (4) | 1
Other | 1 | 0 | 2 | 0
Total increase (decrease) | 7 | 7 | 21 | 20
Total income tax expense (benefit) | 44 | 40 | 125 | 114
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 | 42 | 92 | 98
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 7 | 8 | 17 | 18
Valuation allowance adjustments | 0 | 0 | 0 | 3
Amortization of excess deferred income taxes | (7) | (5) | (20) | (17)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | (5) | 1 | (5) | 1
Kentucky recycling credit, net of federal income tax expense | 0 | 0 | 0 | (20)
Other | 2 | (2) | 0 | (3)
Total increase (decrease) | (4) | 1 | (10) | (20)
Total income tax expense (benefit) | 31 | 43 | 82 | 78
Amortization of Investment Tax Credit | (1) | (1) | (2) | (2)
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 18 | 21 | 50 | 50
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 3 | 4 | 9 | 9
Valuation allowance adjustments | 0 | 0 | 0 | 15
Amortization of excess deferred income taxes | (3) | (2) | (8) | (7)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | (2) | 1 | (2) | 1
Kentucky recycling credit, net of federal income tax expense | 0 | 0 | 0 | (15)
Other | 0 | (2) | (2) | (2)
Total increase (decrease) | (2) | 1 | (3) | 1
Total income tax expense (benefit) | 16 | 22 | 47 | 51
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 22 | 25 | 56 | 63
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 4 | 5 | 11 | 12
Valuation allowance adjustments | 0 | 0 | 0 | 5
Amortization of excess deferred income taxes | (4) | (3) | (12) | (10)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | (3) | 0 | (3) |
Kentucky recycling credit, net of federal income tax expense | 0 | 0 | 0 | (5)
Other | 0 | (1) | (2) | (3)
Total increase (decrease) | (3) | 1 | (6) | (1)
Total income tax expense (benefit) | $ 19 | $ 26 | $ 50 | 62
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  |  |  | $ 0

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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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