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Derivative Instruments and Hedging Activities (Offsetting Derivative Instruments and Credit Risk-Related Features) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | $ 0 | $ 0
Cash collateral pledged eligible for offset - liabilities | 4 | 0
Treasury Derivatives [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Gross assets | 25 | 0
Derivative instruments eligible for offset - assets | 20 | 0
Cash collateral received eligible for offset - assets | 0 | 0
Net assets | 5 | 0
Gross liabilities | 73 | 18
Derivative instruments eligible for offset - liabilities | 62 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Net liabilities | 11 | 18
Louisville Gas And Electric Co [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | 0 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Gross assets | 0 | 0
Derivative instruments eligible for offset - assets | 0 | 0
Cash collateral received eligible for offset - assets | 0 | 0
Net assets | 0 | 0
Gross liabilities | 7 | 18
Derivative instruments eligible for offset - liabilities | 0 | 0
Cash collateral pledged eligible for offset - liabilities | 0 | 0
Net liabilities | 7 | 18
Kentucky Utilities Co [Member] |  |
Offsetting Assets And Liabilities [Line Items] |  |
Cash collateral received eligible for offset - assets | 0 | 0
Cash collateral pledged eligible for offset - liabilities | $ 0 | $ 0

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