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Available-for-Sale Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost $ 486   $ 486   $ 479  
Gross unrealized gains 216   216   187  
Gross unrealized losses 3   3   2  
Fair value 699   699   664  
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]            
Proceeds from sales of NDT securities 45 [1] 25 [1] 79 100    
Other proceeds from sales 5 0 5 163    
Gross realized gains 8 [2] 6 [2] 13 [2] 23 [2]    
Gross realized losses 5 [2] 6 [2] 6 [2] 11 [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 5   5      
Amortized cost - maturity between 1 and 5 years 84   84      
Amortized cost - maturity between 5 and 10 years 61   61      
Amortized cost - maturity in excess of 10 years 76   76      
Amortized cost total 226   226      
Fair value - maturity less than 1 year 5   5      
Fair value - maturity between 1 and 5 years 87   87      
Fair value - maturity between 5 and 10 years 67   67      
Fair value - maturity in excess of 10 years 83   83      
Fair value total 242   242      
Nuclear Decommissioning Trust Funds [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 466   466   454  
Gross unrealized gains 216   216   187  
Gross unrealized losses 1   1   1  
Fair value 681   681   640  
Nuclear Decommissioning Trust Funds [Member] | Cash and Cash Equivalents [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 14   14   12  
Gross unrealized gains 0   0   0  
Gross unrealized losses 0   0   0  
Fair value 14   14   12  
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Large Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 178   178   173  
Gross unrealized gains 139   139   119  
Gross unrealized losses 0   0   0  
Fair value 317   317   292  
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Mid Small Cap [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 69   69   67  
Gross unrealized gains 58   58   50  
Gross unrealized losses 0   0   0  
Fair value 127   127   117  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Treasury [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 86   86   76  
Gross unrealized gains 10   10   10  
Gross unrealized losses 0   0   0  
Fair value 96   96   86  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | US Government Sponsored Agency [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 9   9   9  
Gross unrealized gains 1   1   1  
Gross unrealized losses 0   0   0  
Fair value 10   10   10  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Municipality [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 77   77   80  
Gross unrealized gains 5   5   4  
Gross unrealized losses 1   1   1  
Fair value 81   81   83  
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Investment Grade Corporate [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 32   32   35  
Gross unrealized gains 3   3   3  
Gross unrealized losses 0   0   0  
Fair value 35   35   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 0   0   0  
Gross unrealized losses 0   0   0  
Fair value 2   2   2  
Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost (1)   (1)   0  
Gross unrealized gains 0   0   0  
Gross unrealized losses 0   0   0  
Fair value (1)   (1)   0  
Auction Rate Securities [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 20   20   25  
Gross unrealized gains 0   0   0  
Gross unrealized losses 2   2   1  
Fair value 18   18   24  
PPL Energy Supply LLC [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 483   483   474  
Gross unrealized gains 216   216   187  
Gross unrealized losses 3   3   2  
Fair value 696   696   659  
Available-for-Sale Securities Proceeds From and Realized Gains and Losses (Details) [Abstract]            
Proceeds from sales of NDT securities 45 [1] 25 [1] 79 100    
Other proceeds from sales 3 0 3 0    
Gross realized gains 8 [2] 6 [2] 13 [2] 23 [2]    
Gross realized losses 5 [2] 6 [2] 6 [2] 11 [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 5   5      
Amortized cost - maturity between 1 and 5 years 84   84      
Amortized cost - maturity between 5 and 10 years 61   61      
Amortized cost - maturity in excess of 10 years 73   73      
Amortized cost total 223   223      
Fair value - maturity less than 1 year 5   5      
Fair value - maturity between 1 and 5 years 87   87      
Fair value - maturity between 5 and 10 years 67   67      
Fair value - maturity in excess of 10 years 80   80      
Fair value total 239   239      
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost 466   466   454  
Gross unrealized gains 216   216   187  
Gross unrealized losses 1   1   1  
Fair value 681   681   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 14   14   12  
Gross unrealized gains 0   0   0  
Gross unrealized losses 0   0   0  
Fair value 14   14   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 178   178   173  
Gross unrealized gains 139   139   119  
Gross unrealized losses 0   0   0  
Fair value 317   317   292  
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 69   69   67  
Gross unrealized gains 58   58   50  
Gross unrealized losses 0   0   0  
Fair value 127   127   117  
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 86   86   76  
Gross unrealized gains 10   10   10  
Gross unrealized losses 0   0   0  
Fair value 96   96   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 9   9   9  
Gross unrealized gains 1   1   1  
Gross unrealized losses 0   0   0  
Fair value 10   10   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 77   77   80  
Gross unrealized gains 5   5   4  
Gross unrealized losses 1   1   1  
Fair value 81   81   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 32   32   35  
Gross unrealized gains 3   3   3  
Gross unrealized losses 0   0   0  
Fair value 35   35   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 0   0   0  
Gross unrealized losses 0   0   0  
Fair value 2   2   2  
PPL Energy Supply LLC [Member] | Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
           
Available-for-Sale Securities Balance Sheet (Details) [Abstract]            
Amortized cost (1)   (1)   0  
Gross unrealized gains 0   0   0  
Gross unrealized losses 0   0   0  
Fair value (1)   (1)   0  
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 0   0   0  
Gross unrealized losses 2   2   1  
Fair value 15   15   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.