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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | $ (40) | $ 41 | $ 15 | $ 96
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | (18) | 11 | (5) | 24
Depreciation and other items not normalized | (2) | (2) | (4) | (4)
Valuation allowance adjustments | 26 | 6 | 34 | 12
Amortization of excess deferred income taxes | (8) | (12) | (20) | (23)
Other | 4 | (2) | 1 | (1)
Total increase (decrease) | 385 | (1) | 389 | 5
Total income tax expense (benefit) | 345 | 40 | 404 | 101
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 383 | (2) | 383 | (3)
Deferred Tax Assets, Valuation Allowance | 25 |  | 25 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2021, Amount |  |  | 383 |
Domestic Tax Authority [Member] |  |  |  |
Increase (decrease) due to: [Abstract] |  |  |  |
Net Operating Loss Carryforwards, Used During the Period |  |  | 1,111 |
Deferred Tax Assets, Operating Loss Carryforwards, Adjustment, Domestic | 506 |  | 506 |
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member] |  |  |  |
Increase (decrease) due to: [Abstract] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Used during the period |  |  | 272 |
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 27 | 33 | 59 | 67
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 10 | 12 | 22 | 25
Depreciation and other items not normalized | (2) | (2) | (4) | (4)
Amortization of excess deferred income taxes | (3) | (5) | (6) | (8)
Other | 2 | 2 | 0 | 1
Total increase (decrease) | 7 | 7 | 12 | 14
Total income tax expense (benefit) | 34 | 40 | 71 | 81
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 | 32
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 2 | 2 | 6 | 6
Amortization of excess deferred income taxes | (3) | (2) | (6) | (5)
Other | 1 | 0 | (1) | (2)
Total increase (decrease) | 0 | 0 | (1) | (1)
Total income tax expense (benefit) | 12 | 12 | 31 | 31
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Income Tax Expense [Abstract] |  |  |  |
Federal income tax on Income Before Income Taxes at statutory tax rate | 15 | 13 | 37 | 34
Increase (decrease) due to: [Abstract] |  |  |  |
State income taxes, net of federal income tax benefit | 3 | 3 | 7 | 6
Amortization of excess deferred income taxes | (4) | (4) | (8) | (8)
Other | (1) | (1) | (2) | (1)
Total increase (decrease) | (2) | (2) | (3) | (3)
Total income tax expense (benefit) | $ 13 | $ 11 | $ 34 | $ 31

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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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