XML 103 R64.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($)
$ in Millions
Sep. 30, 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 $ 43  
Aggregate fair value of collateral posted on these derivative instruments 1  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 42  
Treasury Derivatives [Member]    
Assets [Abstract]    
Gross 324 $ 399
Derivative instruments - eligible for offset 138 27
Cash collateral received - eligible for offset 17 19
Net 169 353
Liabilities [Abstract]    
Gross 198 58
Derivative instruments - eligible for offset 138 27
Cash collateral pledged - eligible for offset 1 3
Net 59 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 11  
Aggregate fair value of collateral posted on these derivative instruments 1  
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]    
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 29 31
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 1 3
Net 28 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 11  
Aggregate fair value of collateral posted on these derivative instruments 1  
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]    
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 29 31
Derivative instruments - eligible for offset 0 0
Cash collateral pledged - eligible for offset 1 3
Net $ 28 $ 28