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Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 29  
Aggregate fair value of collateral posted on these derivative instruments 7  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade [1] 22  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 263 $ 295
Derivative instruments - eligible for offset 14 25
Cash collateral received - eligible for offset 0 0
Net 249 270
Liabilities [Abstract]    
Gross 68 72
Derivative instruments - eligible for offset 14 25
Cash collateral pledged - eligible for offset 8 9
Net 46 38
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 29  
Aggregate fair value of collateral posted on these derivative instruments 7  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade [1] 22  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]    
Liabilities [Abstract]    
Gross 54 47
Cash collateral pledged - eligible for offset 8 9
Net 46 38
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 29  
Aggregate fair value of collateral posted on these derivative instruments 7  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade [1] 22  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]    
Liabilities [Abstract]    
Gross 54 47
Cash collateral pledged - eligible for offset 8 9
Net $ 46 $ 38
[1] Includes the effect of net receivables and payables already recorded on the Balance Sheet.