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Derivative Instruments and Hedging Activities - Fair Values (Details) - Not Designated As Hedging Instruments [Member] - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 22 | $ 9
Liability value | 11 | 16
Louisville Gas And Electric Co [Member] |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 0 | 0
Liability value | $ 5 | $ 3

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