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Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 11 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2021
PPL Electric [Member] | Period of 05-21-2020 to 12-31-2020 |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Regulatory Liability due to ROE Reserve, After Tax |  | $ 19 | $ 13 |
Amortization of Revenue Reserve for ROE Challenge | $ 44 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Amortization of Revenue Reserve for ROE Challenge | 44 |  |  |
PPL Electric Utilities Corp [Member] | Period of 05-21-2020 to 12-31-2020 |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Regulatory Liability due to ROE Reserve, After Tax |  | $ 19 | $ 13 |
Regulatory Liability due to ROE Reserve, Before Tax |  |  |  | $ 73
Amortization of Revenue Reserve for ROE Challenge | $ 44 |  |  |
PPL Electric Utilities Corp [Member] | PPL Electric [Member] | Period of 05-21-2020 to 12-31-2020 |  |  |  |
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract] |  |  |  |
Regulatory Liability due to ROE Reserve, Before Tax |  |  |  | $ 73

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