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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
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 derivative instruments in a net liability position with credit risk-related contingent features 0  
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 14 18
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net 14 18
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 14 18
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net $ 14 $ 18