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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 12  
Aggregate fair value of collateral posted on these derivative instruments 2  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 379 $ 399
Derivative instruments - eligible for offset 49 27
Cash collateral received - eligible for offset 13 19
Net 317 353
Liabilities [Abstract]    
Gross 79 58
Derivative instruments - eligible for offset 49 27
Cash collateral pledged - eligible for offset 2 3
Net 28 28
LG And E And KU Energy LLC [Member]    
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 12  
Aggregate fair value of collateral posted on these derivative instruments 2  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]    
Liabilities [Abstract]    
Gross 29 31
Cash collateral pledged - eligible for offset 2 3
Net 27 28
Louisville Gas And Electric Co [Member]    
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 12  
Aggregate fair value of collateral posted on these derivative instruments 2  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]    
Liabilities [Abstract]    
Gross 29 31
Cash collateral pledged - eligible for offset 2 3
Net $ 27 $ 28