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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets [Abstract]    
Cash collateral received - eligible for offset $ 22 $ 14
Liabilities [Abstract]    
Cash collateral pledged - eligible for offset 2 0
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 8  
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 8  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 309 296
Derivative instruments - eligible for offset 0 5
Cash collateral received - eligible for offset 22 14
Net 287 277
Liabilities [Abstract]    
Gross 38 26
Derivative instruments - eligible for offset 0 5
Cash collateral pledged - eligible for offset 2 0
Net 36 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 2  
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 2  
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 28 21
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 2 0
Net 26 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 2 0
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 2  
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 2  
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 28 21
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 2 0
Net $ 26 $ 21