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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets [Abstract] |  |
Cash collateral received - eligible for offset | $ 0 | $ 0
Liabilities [Abstract] |  |
Cash collateral pledged - eligible for offset | 0 | 0
Credit Risk-Related Contingent Features [Abstract] |  |
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade | 29 |
Derivative, Net Liability Position, Aggregate Fair Value | 28 |
Treasury Derivatives [Member] |  |
Assets [Abstract] |  |
Gross | 1 | 1
Derivative instruments - eligible for offset | 0 | 0
Cash collateral received - eligible for offset | 0 | 0
Net | 1 | 1
Liabilities [Abstract] |  |
Gross | 39 | 67
Derivative instruments - eligible for offset | 0 | 0
Cash collateral pledged - eligible for offset | 0 | 0
Net | 39 | 67
Louisville Gas And Electric Co [Member] |  |
Assets [Abstract] |  |
Cash collateral received - eligible for offset | 0 | 0
Liabilities [Abstract] |  |
Cash collateral pledged - eligible for offset | 0 | 0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member] |  |
Assets [Abstract] |  |
Gross | 0 | 0
Derivative instruments - eligible for offset | 0 | 0
Cash collateral received - eligible for offset | 0 | 0
Net | 0 | 0
Liabilities [Abstract] |  |
Gross |  | 7
Derivative instruments - eligible for offset | 0 | 0
Cash collateral pledged - eligible for offset | 0 | 0
Net | $ 5 | $ 7

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