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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Liabilities [Abstract]    
Cash collateral pledged - eligible for offset $ 22 $ 0
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 161  
Aggregate fair value of collateral posted on these derivative instruments 22  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 139  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 62 146
Derivative instruments - eligible for offset 18 34
Cash collateral received - eligible for offset 0 0
Net 44 112
Liabilities [Abstract]    
Gross 197 160
Derivative instruments - eligible for offset 18 34
Cash collateral pledged - eligible for offset 22 0
Net 157 126
LG And E And KU Energy LLC [Member]    
Assets [Abstract]    
Cash collateral received - eligible for offset 0 0
Liabilities [Abstract]    
Cash collateral pledged - eligible for offset 0 0
LG And E And KU Energy LLC [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 17 23
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net 17 23
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 17 23
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net $ 17 $ 23