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Available-for-Sale Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost $ 490   $ 490   $ 479  
Gross unrealized gains 242   242   187  
Gross unrealized losses 2   2   2  
Fair value 730   730   664  
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]            
Proceeds from sales of NDT securities 23 [1] 34 [1] 102 134    
Other proceeds from sales       5 163    
Gross realized gains 2 [2] 3 [2] 15 [2] 26 [2]    
Gross realized losses 2 [2] 4 [2] 8 [2] 15 [2]    
Short Term Investments (Numeric) [Abstract]            
Principal amount of tax-exempt revenue bonds held as short-term investment           163
Debt Securities [Member]
           
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]            
Amortized cost - maturity less than 1 year 11   11      
Amortized cost - maturity between 1 and 5 years 81   81      
Amortized cost - maturity between 5 and 10 years 61   61      
Amortized cost - maturity in excess of 10 years 77   77      
Amortized cost total 230   230      
Fair value - maturity less than 1 year 11   11      
Fair value - maturity between 1 and 5 years 85   85      
Fair value - maturity between 5 and 10 years 67   67      
Fair value - maturity in excess of 10 years 85   85      
Fair value total 248   248      
Nuclear Decommissioning Trust Funds [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 470   470   454  
Gross unrealized gains 242   242   187  
Gross unrealized losses 1   1   1  
Fair value 711   711   640  
Nuclear Decommissioning Trust Funds [Member] | Cash and Cash Equivalents [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 12   12   12  
Gross unrealized gains               
Gross unrealized losses               
Fair value 12   12   12  
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Large Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 219   219   211  
Gross unrealized gains 193   193   146  
Gross unrealized losses               
Fair value 412   412   357  
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Mid Small Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 30   30   29  
Gross unrealized gains 29   29   23  
Gross unrealized losses               
Fair value 59   59   52  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Treasury [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 85   85   76  
Gross unrealized gains 10   10   10  
Gross unrealized losses               
Fair value 95   95   86  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Government Sponsored Agency [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 8   8   9  
Gross unrealized gains 1   1   1  
Gross unrealized losses               
Fair value 9   9   10  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Municipality [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 79   79   80  
Gross unrealized gains 5   5   4  
Gross unrealized losses 1   1   1  
Fair value 83   83   83  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Investment Grade Corporate [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 36   36   35  
Gross unrealized gains 4   4   3  
Gross unrealized losses               
Fair value 40   40   38  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Other [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 2   2   2  
Gross unrealized gains               
Gross unrealized losses               
Fair value 2   2   2  
Nuclear Decommissioning Trust Funds [Member] | Receivables/payables, net
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost (1)   (1)       
Gross unrealized gains               
Gross unrealized losses               
Fair value (1)   (1)       
Auction Rate Securities [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 20   20   25  
Gross unrealized gains               
Gross unrealized losses 1   1   1  
Fair value 19   19   24  
PPL Energy Supply LLC [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 487   487   474  
Gross unrealized gains 242   242   187  
Gross unrealized losses 2   2   2  
Fair value 727   727   659  
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]            
Proceeds from sales of NDT securities 23 [1] 34 [1] 102 134    
Other proceeds from sales       3       
Gross realized gains 2 [2] 3 [2] 15 [2] 26 [2]    
Gross realized losses 2 [2] 4 [2] 8 [2] 15 [2]    
PPL Energy Supply LLC [Member] | Debt Securities [Member]
           
Available-for-Sale Securities Scheduled Maturity Dates of Debt Securities (Details) [Abstract]            
Amortized cost - maturity less than 1 year 11   11      
Amortized cost - maturity between 1 and 5 years 81   81      
Amortized cost - maturity between 5 and 10 years 61   61      
Amortized cost - maturity in excess of 10 years 74   74      
Amortized cost total 227   227      
Fair value - maturity less than 1 year 11   11      
Fair value - maturity between 1 and 5 years 85   85      
Fair value - maturity between 5 and 10 years 67   67      
Fair value - maturity in excess of 10 years 82   82      
Fair value total 245   245      
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 470   470   454  
Gross unrealized gains 242   242   187  
Gross unrealized losses 1   1   1  
Fair value 711   711   640  
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 12   12   12  
Gross unrealized gains               
Gross unrealized losses               
Fair value 12   12   12  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Large Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 219   219   211  
Gross unrealized gains 193   193   146  
Gross unrealized losses               
Fair value 412   412   357  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Mid Small Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 30   30   29  
Gross unrealized gains 29   29   23  
Gross unrealized losses               
Fair value 59   59   52  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Treasury [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 85   85   76  
Gross unrealized gains 10   10   10  
Gross unrealized losses               
Fair value 95   95   86  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Government Sponsored Agency [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 8   8   9  
Gross unrealized gains 1   1   1  
Gross unrealized losses               
Fair value 9   9   10  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Municipality [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 79   79   80  
Gross unrealized gains 5   5   4  
Gross unrealized losses 1   1   1  
Fair value 83   83   83  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Investment Grade Corporate [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 36   36   35  
Gross unrealized gains 4   4   3  
Gross unrealized losses               
Fair value 40   40   38  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Other [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 2   2   2  
Gross unrealized gains               
Gross unrealized losses               
Fair value 2   2   2  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Receivables/payables, net
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost (1)   (1)       
Gross unrealized gains               
Gross unrealized losses               
Fair value (1)   (1)       
PPL Energy Supply LLC [Member] | Auction Rate Securities [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 17   17   20  
Gross unrealized gains               
Gross unrealized losses 1   1   1  
Fair value 16   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] These proceeds are used to pay income taxes and fees related to managing the trust. Remaining proceeds are reinvested in the trust.
[2] Excludes the impact of other-than-temporary impairment charges recognized in the Statements of Income.