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Derivative Instruments and Hedging Activities (Offseting Derivative Instruments and Credit Risk-Related Features) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Offsetting Assets And Liabilities [Line Items]    
Gross assets $ 1,933 $ 2,097
Derivative instruments eligible for offset - assets 1,225 1,432
Cash collateral received eligible for offset - assets 29 111
Net assets 679 554
Gross liabilities 1,401 1,694
Derivative instruments eligible for offset - liabilities 1,225 1,432
Cash collateral pledged eligible for offset - liabilities 34 39
Net liabilities 142 223
Credit Risk-Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features 148  
Aggregate fair value of collateral posted on these derivative instruments 22  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 144 [1]  
Energy Commodities [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 1,654 2,068
Derivative instruments eligible for offset - assets 1,221 1,413
Cash collateral received eligible for offset - assets 29 111
Net assets 404 544
Gross liabilities 1,351 1,566
Derivative instruments eligible for offset - liabilities 1,221 1,413
Cash collateral pledged eligible for offset - liabilities 12 9
Net liabilities 118 144
Treasury Derivatives [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 279 29
Derivative instruments eligible for offset - assets 4 19
Cash collateral received eligible for offset - assets      
Net assets 275 10
Gross liabilities 50 128
Derivative instruments eligible for offset - liabilities 4 19
Cash collateral pledged eligible for offset - liabilities 22 30
Net liabilities 24 79
PPL Energy Supply 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 118  
Aggregate fair value of collateral posted on these derivative instruments     
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 136 [1]  
PPL Energy Supply LLC [Member] | Energy Commodities [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 1,654 2,068
Derivative instruments eligible for offset - assets 1,221 1,413
Cash collateral received eligible for offset - assets 29 111
Net assets 404 544
Gross liabilities 1,351 1,566
Derivative instruments eligible for offset - liabilities 1,221 1,413
Cash collateral pledged eligible for offset - liabilities 12 9
Net liabilities 118 144
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 30  
Aggregate fair value of collateral posted on these derivative instruments 22  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 8 [1]  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 72 14
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 72 14
Gross liabilities 43 58
Derivative instruments eligible for offset - liabilities      
Cash collateral pledged eligible for offset - liabilities 22 30
Net liabilities 21 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 30  
Aggregate fair value of collateral posted on these derivative instruments 22  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 8 [1]  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 36 7
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 36 7
Gross liabilities 43 58
Derivative instruments eligible for offset - liabilities      
Cash collateral pledged eligible for offset - liabilities 22 30
Net liabilities 21 28
Kentucky Utilities Co [Member] | Treasury Derivatives [Member]
   
Offsetting Assets And Liabilities [Line Items]    
Gross assets 36 7
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 36 7
Gross liabilities      
Derivative instruments eligible for offset - liabilities      
Cash collateral pledged eligible for offset - liabilities      
Net liabilities      
[1] Includes the effect of net receivables and payables already recorded on the Balance Sheet.