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Available-for-Sale Securities (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost $ 478   $ 478   $ 624
Gross unrealized gains     196   182
Gross unrealized losses     1   0
Fair value 673   673   806
Available-for-sale securities proceeds from and realized gains and losses [Abstract]          
Proceeds from sales of NDT securities 25 [1] 24 [1] 100 68  
Other proceeds from sales 0 0 163 0  
Gross realized gains 6 [2] 4 [2] 23 [2] 9 [2]  
Gross realized losses 6 [2] 2 [2] 11 [2] 3 [2]  
PPL Energy Supply [Member]
         
Available-for-sale securities proceeds from and realized gains and losses [Abstract]          
Proceeds from sales of NDT securities     100 68  
Short-Term Investments - Municipal Debt Securities [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 0   0   163
Gross unrealized gains     0   0
Gross unrealized losses     0   0
Fair value 0   0   163
Short Term Investments Abstract          
Principal amount of tax-exempt revenue bonds held as short-term investment 163   163    
Proceeds received from the remarketing of certain Kentucky tax-exempt revenue bonds     163    
Nuclear Decommissioning Trust Funds [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 453   453   436
Gross unrealized gains     196   182
Gross unrealized losses     1   0
Fair value 648   648   618
Nuclear Decommissioning Trust Funds [Member] | Cash and Cash Equivalents [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 10   10   10
Gross unrealized gains     0   0
Gross unrealized losses     0   0
Fair value 10   10   10
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Large Cap [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 173   173   180
Gross unrealized gains     131   123
Gross unrealized losses     0   0
Fair value 304   304   303
Nuclear Decommissioning Trust Funds [Member] | Equity Securities [Member] | US Mid Small Cap [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 68   68   67
Gross unrealized gains     56   52
Gross unrealized losses     0   0
Fair value 124   124   119
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | U.S. Treasury [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 74   74   71
Gross unrealized gains     5   4
Gross unrealized losses     0   0
Fair value 79   79   75
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | U.S. Government Sponsored Agency [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 10   10   6
Gross unrealized gains     0   1
Gross unrealized losses     0   0
Fair value 10   10   7
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Municipal Debt Securities [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 79   79   69
Gross unrealized gains     2   0
Gross unrealized losses     1   0
Fair value 80   80   69
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Investment-grade Corporate [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 35   35   31
Gross unrealized gains     2   2
Gross unrealized losses     0   0
Fair value 37   37   33
Nuclear Decommissioning Trust Funds [Member] | Debt Securities [Member] | Other [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 3   3   1
Gross unrealized gains     0   0
Gross unrealized losses     0   0
Fair value 3   3   1
Nuclear Decommissioning Trust Funds [Member] | Receivables Payables Net [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 1   1   1
Gross unrealized gains     0   0
Gross unrealized losses     0   0
Fair value 1   1   1
Auction Rate Securities [Member]
         
Available-for-sale securities balance sheet details [Abstract]          
Amortized cost 25   25   25
Gross unrealized gains     0   0
Gross unrealized losses     0   0
Fair value 25   25   25
Debt Securities [Member]
         
Available-for-sale securities scheduled maturity dates of debt securities [Abstract]          
Amortized cost - maturity less than 1 year 11   11    
Amortized cost - maturity between 1 and 5 years 69   69    
Amortized cost - maturity between 5 and 10 years 66   66    
Amortized cost - maturity in excess of 10 years 80   80    
Amortized cost total 226   226    
Fair value - maturity less than 1 year 12   12    
Fair value - maturity between 1 and 5 years 71   71    
Fair value - Maturity between 5 and 10 years 69   69    
Fair value - maturity in excess of 10 years 82   82    
Fair value total $ 234   $ 234    
[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.