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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ 48 | $ 50 | $ 157 | $ 132
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 8 | 11 | 28 | 28
Depreciation and other items not normalized | (5) | (5) | (14) | (10)
Valuation allowance adjustments | 2 | 2 | 6 | 5
Amortization of excess deferred income taxes | (6) | (7) | (21) | (20)
Other | 1 | (1) | (3) | (2)
Total increase (decrease) | (1) | 0 | (8) | (1)
Total income tax expense (benefit) | 47 | 50 | 149 | 131
Amortization of investment tax credit including deferred taxes on basis adjustment | (1) | 0 | (4) | (2)
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 38 | 41 | 88 | 83
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 11 | 13 | 27 | 26
Depreciation and other items not normalized | (6) | (6) | (12) | (10)
Amortization of excess deferred income taxes | (2) | (3) | (5) | (5)
Other | 2 | 1 | (1) | 0
Total increase (decrease) | 5 | 5 | 9 | 11
Total income tax expense (benefit) | 43 | 46 | 97 | 94
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 15 | 17 | 42 | 41
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 3 | 3 | 8 | 7
Amortization of excess deferred income taxes | (3) | (3) | (7) | (6)
Other | (1) | 0 | (3) | (1)
Total increase (decrease) | (1) | 0 | (2) | 0
Total income tax expense (benefit) | 14 | 17 | 40 | 41
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 20 | 20 | 53 | 48
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 4 | 4 | 10 | 9
Amortization of excess deferred income taxes | (4) | (4) | (9) | (9)
Other | (1) | (1) | (4) | (2)
Total increase (decrease) | (1) | (1) | (3) | (2)
Total income tax expense (benefit) | $ 19 | $ 19 | $ 50 | $ 46

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