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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ 60 | $ 45 | $ 167 | $ 150
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 16 | 8 | 49 | 56
Depreciation and other items not normalized | (2) | 0 | (9) | (8)
Valuation allowance adjustments | 1 | (1) | 6 | 9
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | (9) | (1) | (11) | (3)
Amortization of excess deferred income taxes | (13) | (7) | (33) | (47)
State income tax rate change | (1) | 5 | 0 | 5
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | 3 | 0 | (2) | (1)
Other | 2 | 2 | 5 | 3
Total increase (decrease) | (2) | (4) | 3 | (3)
Total income tax expense (benefit) | 58 | 41 | 170 | 147
Amortization of investment tax credit including deferred taxes on basis adjustment | (1) | 0 | (2) | (7)
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 38 | 38 | 107 | 114
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 13 | 14 | 36 | 43
Depreciation and other items not normalized | (1) | (1) | (8) | (7)
Amortization of excess deferred income taxes | (4) | (4) | (8) | (9)
State income tax rate change | 0 | 9 | 1 | 9
Other | (3) | (1) | 0 | (1)
Total increase (decrease) | 5 | (1) | 19 | 17
Total income tax expense (benefit) | 43 | 37 | 126 | 131
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 21 | 21 | 56 | 57
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 4 | 4 | 10 | 11
Amortization of excess deferred income taxes | (3) | (3) | (9) | (17)
Other | (1) | (1) | (2) | (2)
Total increase (decrease) | 0 | 0 | (1) | (8)
Total income tax expense (benefit) | 21 | 21 | 55 | 49
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 26 | 25 | 63 | 70
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 5 | 5 | 12 | 13
Amortization of excess deferred income taxes | (5) | (4) | (13) | (16)
Other | (2) | (2) | (3) | (4)
Total increase (decrease) | (2) | (1) | (4) | (7)
Total income tax expense (benefit) | $ 24 | $ 24 | $ 59 | $ 63

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