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Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 503 | $ 314 | $ 183
Net Increase in Regulatory Liability | (52) | 63 | 88
Deferred Tax Liabilities, Net | 3,139 | 2,519 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2021, Amount | 383 |  |
Deferred Tax Assets, Valuation Allowance, Increase due to Loss on Extinguishment of Debt | 31 |  |
PPL Electric Utilities Corp [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 154 | 167 | 149
Net Increase in Regulatory Liability | (96) | 40 | 43
Deferred Tax Liabilities, Net | 1,668 | 1,559 |
Louisville Gas And Electric Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 54 | 62 | 63
Net Increase in Regulatory Liability | 23 | 0 | 19
Deferred Tax Liabilities, Net | 751 | 716 |
Kentucky Utilities Co [Member] |  |  |
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | 67 | 63 | 79
Net Increase in Regulatory Liability | 22 | 26 | $ 26
Deferred Tax Liabilities, Net | $ 865 | $ 835 |

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