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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets [Abstract]    
Cash collateral received - eligible for offset $ 9 $ 14
Liabilities [Abstract]    
Cash collateral pledged - eligible for offset 1 0
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 6  
Aggregate fair value of collateral posted on these derivative instruments 0  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 6  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 189 296
Derivative instruments - eligible for offset 1 5
Cash collateral received - eligible for offset 9 14
Net 179 277
Liabilities [Abstract]    
Gross 35 26
Derivative instruments - eligible for offset 1 5
Cash collateral pledged - eligible for offset 1 0
Net 33 21
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
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 1  
Aggregate fair value of collateral posted on these derivative instruments 0  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 1  
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 26 21
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 1 0
Net 25 21
Louisville Gas And Electric Co [Member]    
Assets [Abstract]    
Cash collateral received - eligible for offset 0 0
Liabilities [Abstract]    
Cash collateral pledged - eligible for offset 1 0
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 1  
Aggregate fair value of collateral posted on these derivative instruments 0  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 1  
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 26 21
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 1 0
Net $ 25 $ 21