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Available-for-Sale Securities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost $ 494 $ 479  
Gross unrealized gains 239 187  
Gross unrealized losses 2 2  
Fair value 731 664  
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]      
Amortized cost - maturity less than 1 year 12    
Amortized cost - maturity between 1 and 5 years 79    
Amortized cost - maturity between 6 and 10 years 62    
Amortized cost - maturity in excess of 10 years 78    
Amortized cost total 231    
Fair value - maturity less than 1 year 12    
Fair value - maturity between 1 and 5 years 83    
Fair value - maturity between 6 and 10 years 68    
Fair value - maturity in excess of 10 years 85    
Fair value total 248    
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]      
Proceeds from sales of NDT securities 139 156 114
Other proceeds from sales 5 163   
Gross realized gains 29 [1] 28 [1] 13 [1]
Gross realized losses 21 [1] 16 [1] 5 [1]
Short Term Investments (Numeric) [Abstract]      
Principal amount of tax-exempt revenue bonds held as short-term investment     163
Nuclear Decommissioning Trust Funds [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 474 454  
Gross unrealized gains 239 187  
Gross unrealized losses 1 1  
Fair value 712 640  
Nuclear Decommissioning Trust Funds (Numeric) [Abstract]      
Percentage of shortfall PPL Susquehanna would be obligated to fund 90.00%    
Impairments recorded to NDT securities 1 6 3
Nuclear Decommissioning Trust Funds [Member] | Cash And Cash Equivalents [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 11 12  
Gross unrealized gains        
Gross unrealized losses        
Fair value 11 12  
Nuclear Decommissioning Trust Funds [Member] | US Large Cap Equity Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 222 211  
Gross unrealized gains 190 146  
Gross unrealized losses        
Fair value 412 357  
Nuclear Decommissioning Trust Funds [Member] | US Mid Small Cap Equity Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 30 29  
Gross unrealized gains 30 23  
Gross unrealized losses        
Fair value 60 52  
Nuclear Decommissioning Trust Funds [Member] | US Treasury Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 86 76  
Gross unrealized gains 9 10  
Gross unrealized losses        
Fair value 95 86  
Nuclear Decommissioning Trust Funds [Member] | US Government Sponsored Agency Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 8 9  
Gross unrealized gains 1 1  
Gross unrealized losses        
Fair value 9 10  
Nuclear Decommissioning Trust Funds [Member] | Municipality Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 78 80  
Gross unrealized gains 5 4  
Gross unrealized losses 1 1  
Fair value 82 83  
Nuclear Decommissioning Trust Funds [Member] | Investment Grade Corporate Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 36 35  
Gross unrealized gains 4 3  
Gross unrealized losses        
Fair value 40 38  
Nuclear Decommissioning Trust Funds [Member] | Other Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 3 2  
Gross unrealized gains        
Gross unrealized losses        
Fair value 3 2  
Auction Rate Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 20 25  
Gross unrealized gains        
Gross unrealized losses 1 1  
Fair value 19 24  
PPL Energy Supply LLC [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 491 474  
Gross unrealized gains 239 187  
Gross unrealized losses 2 2  
Fair value 728 659  
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]      
Amortized cost - maturity less than 1 year 12    
Amortized cost - maturity between 1 and 5 years 79    
Amortized cost - maturity between 6 and 10 years 62    
Amortized cost - maturity in excess of 10 years 75    
Amortized cost total 228    
Fair value - maturity less than 1 year 12    
Fair value - maturity between 1 and 5 years 83    
Fair value - maturity between 6 and 10 years 68    
Fair value - maturity in excess of 10 years 82    
Fair value total 245    
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]      
Proceeds from sales of NDT securities 139 156 114
Other proceeds from sales 3      
Gross realized gains 29 [1] 28 [1] 13 [1]
Gross realized losses 21 [1] 16 [1] 5 [1]
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 474 454  
Gross unrealized gains 239 187  
Gross unrealized losses 1 1  
Fair value 712 640  
Nuclear Decommissioning Trust Funds (Numeric) [Abstract]      
Percentage of shortfall PPL Susquehanna would be obligated to fund 90.00%    
Impairments recorded to NDT securities 1 6 3
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Cash And Cash Equivalents [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 11 12  
Gross unrealized gains        
Gross unrealized losses        
Fair value 11 12  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | US Large Cap Equity Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 222 211  
Gross unrealized gains 190 146  
Gross unrealized losses        
Fair value 412 357  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | US Mid Small Cap Equity Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 30 29  
Gross unrealized gains 30 23  
Gross unrealized losses        
Fair value 60 52  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | US Treasury Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 86 76  
Gross unrealized gains 9 10  
Gross unrealized losses        
Fair value 95 86  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | US Government Sponsored Agency Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 8 9  
Gross unrealized gains 1 1  
Gross unrealized losses        
Fair value 9 10  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Municipality Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 78 80  
Gross unrealized gains 5 4  
Gross unrealized losses 1 1  
Fair value 82 83  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Investment Grade Corporate Debt Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 36 35  
Gross unrealized gains 4 3  
Gross unrealized losses        
Fair value 40 38  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 3 2  
Gross unrealized gains        
Gross unrealized losses        
Fair value 3 2  
PPL Energy Supply LLC [Member] | Auction Rate Securities [Member]
     
Available-for-Sale Securities Balance Sheet (Details) [Abstract]      
Amortized cost 17 20  
Gross unrealized gains        
Gross unrealized losses 1 1  
Fair value 16 19  
LG And E And KU Energy LLC [Member]
     
Short Term Investments (Numeric) [Abstract]      
Principal amount of tax-exempt revenue bonds held as short-term investment     163
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds   163  
Louisville Gas And Electric Co [Member]
     
Short Term Investments (Numeric) [Abstract]      
Principal amount of tax-exempt revenue bonds held as short-term investment     163
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds   $ 163  
[1] Excludes the impact of other-than-temporary impairment charges recognized on the Statements of Income.