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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets [Abstract]    
Cash collateral received - eligible for offset $ 17 $ 40
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 7  
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 7  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 281 337
Derivative instruments - eligible for offset 12 2
Cash collateral received - eligible for offset 17 40
Net 252 295
Liabilities [Abstract]    
Gross 34 22
Derivative instruments - eligible for offset 12 2
Cash collateral pledged - eligible for offset 0 0
Net 22 20
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
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 5  
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 5  
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 21 20
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net 21 20
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
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 5  
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 5  
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 21 20
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 0 0
Net $ 21 $ 20