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Fair Value Measurements - Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | $ 16,507 | $ 16,503
Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 15,847 | 15,562
PPL Electric Utilities Corp [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 5,214 | 5,214
PPL Electric Utilities Corp [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 4,931 | 4,862
Louisville Gas And Electric Co [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 2,471 | 2,471
Louisville Gas And Electric Co [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 2,335 | 2,295
Kentucky Utilities Co [Member] | Carrying Amount [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | 3,066 | 3,066
Kentucky Utilities Co [Member] | Fair Value [Member] |  |
Fair Value of Financial Instruments Not Recorded at Fair Value - Other |  |
Debt Instrument, Fair Value Disclosure | $ 2,804 | $ 2,750

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