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Derivative Instruments and Hedging Activities (Offseting Derivative Instruments and Credit Risk-Related Features) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Offsetting Assets and Liabilities [Line Items]    
Gross assets $ 1,882 $ 2,097
Derivative instruments eligible for offset - assets 1,322 1,432
Cash collateral received eligible for offset - assets 48 111
Net assets 512 554
Gross liabilities 1,505 1,694
Derivative instruments eligible for offset - liabilities 1,322 1,432
Cash collateral pledged eligible for offset - liabilities 41 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 146  
Aggregate fair value of collateral posted on these derivative instruments 27  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 151 [1]  
Energy Commodities [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 1,676 2,068
Derivative instruments eligible for offset - assets 1,306 1,413
Cash collateral received eligible for offset - assets 48 111
Net assets 322 544
Gross liabilities 1,432 1,566
Derivative instruments eligible for offset - liabilities 1,306 1,413
Cash collateral pledged eligible for offset - liabilities 15 9
Net liabilities 111 144
Treasury Derivatives [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 206 29
Derivative instruments eligible for offset - assets 16 19
Cash collateral received eligible for offset - assets      
Net assets 190 10
Gross liabilities 73 128
Derivative instruments eligible for offset - liabilities 16 19
Cash collateral pledged eligible for offset - liabilities 26 30
Net liabilities 31 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 110  
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 141 [1]  
PPL Energy Supply LLC [Member] | Energy Commodities [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 1,676 2,068
Derivative instruments eligible for offset - assets 1,306 1,413
Cash collateral received eligible for offset - assets 48 111
Net assets 322 544
Gross liabilities 1,432 1,566
Derivative instruments eligible for offset - liabilities 1,306 1,413
Cash collateral pledged eligible for offset - liabilities 15 9
Net liabilities 111 144
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 36  
Aggregate fair value of collateral posted on these derivative instruments 27  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10 [1]  
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 24 14
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 24 14
Gross liabilities 54 58
Derivative instruments eligible for offset - liabilities      
Cash collateral pledged eligible for offset - liabilities 26 30
Net liabilities 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 36  
Aggregate fair value of collateral posted on these derivative instruments 27  
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade 10 [1]  
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 12 7
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 12 7
Gross liabilities 54 58
Derivative instruments eligible for offset - liabilities      
Cash collateral pledged eligible for offset - liabilities 26 30
Net liabilities 28 28
Kentucky Utilities Co [Member] | Treasury Derivatives [Member]
   
Offsetting Assets and Liabilities [Line Items]    
Gross assets 12 7
Derivative instruments eligible for offset - assets      
Cash collateral received eligible for offset - assets      
Net assets 12 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.