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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