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Fair Value Measurements and Credit Concentration (Tables)
 9 Months Ended
Sep. 30, 2013
Fair Value Measurements and Credit Concentration [Line Items]  
Fair Value of Assets and Liabilities Measured on Recurring Basis

The assets and liabilities measured at fair value were:

     September 30, 2013 December 31, 2012
     Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3
PPL                        
Assets                        
 Cash and cash equivalents  $ 1,291 $ 1,291       $ 901 $ 901      
 Restricted cash and cash equivalents (a)   120   120         135   135      
 Price risk management assets:                        
  Energy commodities   1,480   7 $ 1,421 $ 52   2,068   2 $ 2,037 $ 29
  Interest rate swaps   86      86      15      15   
  Foreign currency contracts   1      1               
  Cross-currency swaps   28      28      14      13   1
 Total price risk management assets   1,595   7   1,536   52   2,097   2   2,065   30
 NDT funds:                        
  Cash and cash equivalents   14   14         11   11      
  Equity securities                        
   U.S. large-cap   494   369   125      412   308   104   
   U.S. mid/small-cap   74   30   44      60   25   35   
  Debt securities                        
   U.S. Treasury   96   96         95   95      
   U.S. government sponsored agency   6      6      9      9   
   Municipality   75      75      82      82   
   Investment-grade corporate   40      40      40      40   
   Other   3      3      3      3   
  Receivables (payables), net   2      2         (2)   2   
 Total NDT funds   804   509   295      712   437   275   
 Auction rate securities (b)   19         19   19      3   16
Total assets $ 3,829 $ 1,927 $ 1,831 $ 71 $ 3,864 $ 1,475 $ 2,343 $ 46
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,235 $ 4 $ 1,226 $ 5 $ 1,566 $ 2 $ 1,557 $ 7
  Interest rate swaps   58      58      80      80   
  Foreign currency contracts   67      67      44      44   
  Cross-currency swaps   1      1      4      4   
 Total price risk management liabilities $ 1,361 $ 4 $ 1,352 $ 5 $ 1,694 $ 2 $ 1,685 $ 7
                            
PPL Energy Supply                        
Assets                        
 Cash and cash equivalents $ 551 $ 551       $ 413 $ 413      
 Restricted cash and cash equivalents (a)   54   54         63   63      
 Price risk management assets:                        
  Energy commodities   1,480   7 $ 1,421 $ 52   2,068   2 $ 2,037 $ 29
 Total price risk management assets   1,480   7   1,421   52   2,068   2   2,037   29
 NDT funds:                        
  Cash and cash equivalents   14   14         11   11      
  Equity securities                        
   U.S. large-cap   494   369   125      412   308   104   
   U.S. mid/small-cap   74   30   44      60   25   35   
  Debt securities                        
   U.S. Treasury   96   96         95   95      
   U.S. government sponsored agency   6      6      9      9   
   Municipality   75      75      82      82   
   Investment-grade corporate   40      40      40      40   
   Other   3      3      3      3   
  Receivables (payables), net   2      2         (2)   2   
 Total NDT funds   804   509   295      712   437   275   
 Auction rate securities (b)   16         16   16      3   13
Total assets $ 2,905 $ 1,121 $ 1,716 $ 68 $ 3,272 $ 915 $ 2,315 $ 42
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,235 $ 4 $ 1,226 $ 5 $ 1,566 $ 2 $ 1,557 $ 7
 Total price risk management liabilities $ 1,235 $ 4 $ 1,226 $ 5 $ 1,566 $ 2 $ 1,557 $ 7
                            
PPL Electric                        
Assets                        
 Cash and cash equivalents $ 225 $ 225       $ 140 $ 140      
 Restricted cash and cash equivalents (c)   12   12         13   13      
Total assets $ 237 $ 237       $ 153 $ 153      

LKE                        
Assets                        
 Cash and cash equivalents  $ 21 $ 21       $ 43 $ 43      
 Restricted cash and cash equivalents (d)   22   22         32   32      
 Price risk management assets:                        
   Interest rate swaps               14    $ 14   
 Total price risk management assets               14      14   
Total assets $ 43 $ 43       $ 89 $ 75 $ 14   
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps  $ 55    $ 55    $ 58    $ 58   
Total price risk management liabilities $ 55    $ 55    $ 58    $ 58   
                            
LG&E                        
Assets                        
 Cash and cash equivalents $ 12 $ 12       $ 22 $ 22      
 Restricted cash and cash equivalents (d)   22   22         32   32      
 Price risk management assets:                        
   Interest rate swaps               7    $ 7   
 Total price risk management assets               7      7   
Total assets $ 34 $ 34       $ 61 $ 54 $ 7   
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps  $ 48    $ 48    $ 58    $ 58   
Total price risk management liabilities $ 48    $ 48    $ 58    $ 58   
                            
KU                        
Assets                        
 Cash and cash equivalents $ 9 $ 9       $ 21 $ 21      
 Price risk management assets:                        
   Interest rate swaps               7    $ 7   
 Total price risk management assets               7      7   
Total assets $ 9 $ 9       $ 28 $ 21 $ 7   
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps  $ 7    $ 7               
Total price risk management liabilities $ 7    $ 7               

(a)       Current portion is included in "Restricted cash and cash equivalents" and the long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

(b)       Included in "Other investments" on the Balance Sheets.

(c)       Current portion is included in "Other current assets" and the long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

(d)       Included in "Other noncurrent assets" on the Balance Sheets.

Reconciliation of Net Assets and Liabilities Classified as Level 3
A reconciliation of net assets and liabilities classified as Level 3 for the periods ended September 30, 2013 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Three Months Nine Months
      Energy  Auction  Cross-    Energy  Auction Cross-   
      Commodities, Rate  Currency    Commodities,  Rate  Currency   
       net Securities Swaps Total  net Securities Swaps Total
PPL                        
Balance at beginning of                        
 period $ 40 $ 19 $ 3 $ 62 $ 22 $ 16 $ 1 $ 39
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   18         18   23         23
    Included in OCI (a)         (2)   (2)         1   1
  Sales               (2)         (2)
  Settlements   (2)         (2)   1         1
  Transfers into Level 3   (7)         (7)   1   3   3   7
  Transfers out of Level 3   (2)      (1)   (3)   2      (5)   (3)
Balance at end of period $ 47 $ 19 $  $ 66 $ 47 $ 19 $  $66
                             
PPL Energy Supply                        
Balance at beginning of                         
 period $ 40 $ 16    $ 56 $ 22 $ 13    $ 35
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   18         18   23         23
  Sales               (2)         (2)
  Settlements   (2)         (2)   1         1
  Transfers into Level 3   (7)         (7)   1   3      4
  Transfers out of Level 3   (2)         (2)   2         2
Balance at end of period $ 47 $ 16    $ 63 $ 47 $ 16    $ 63

(a)       "Energy Commodities, net" and "Cross-Currency Swaps" are included in "Qualifying derivatives" and "Auction Rate Securities" are included in "Available-for-sale securities" on the Statements of Comprehensive Income.

A reconciliation of net assets and liabilities classified as Level 3 for the periods ended September 30, 2012 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Three Months Nine Months
      Energy  Auction  Cross-    Energy  Auction Cross-   
      Commodities, Rate  Currency    Commodities,  Rate  Currency   
       net Securities Swaps Total  net Securities Swaps Total
PPL                        
Balance at beginning of                         
 period $ 34 $ 15 $ 10 $ 59 $ 13 $ 24 $ 4 $ 41
  Total realized/unrealized                        
   gains (losses)                        
    Included in earnings   (17)         (17)   (1)      (1)   (2)
    Included in OCI (a)      1   (8)   (7)   1      2   3
  Sales                  (5)      (5)
  Settlements   2         2   (9)         (9)
  Transfers into Level 3   (2)         (2)   12         12
  Transfers out of Level 3   8         8   9   (3)   (3)   3
Balance at end of period $ 25 $ 16 $ 2 $ 43 $ 25 $ 16 $ 2 $ 43
                             
PPL Energy Supply                        
Balance at beginning of                        
 period $ 34 $ 12    $ 46 $ 13 $ 19    $ 32
  Total realized/unrealized                        
   gains (losses)                        
    Included in earnings   (17)         (17)   (1)         (1)
    Included in OCI (a)      1      1   1         1
  Sales                  (3)      (3)
  Settlements   2         2   (9)         (9)
  Transfers into Level 3   (2)         (2)   12         12
  Transfers out of Level 3   8         8   9   (3)      6
Balance at end of period $ 25 $ 13    $ 38 $ 25 $ 13    $ 38

(a)       "Energy Commodities, net" and "Cross-Currency Swaps" are included in "Qualifying derivatives" and "Auction Rate Securities" are included in "Available-for-sale securities" on the Statements of Comprehensive Income.

Significant Unobservable Inputs Used in Fair Value Measurement of Assets and Liabilities Classified as Level 3

The significant unobservable inputs used in and quantitative information about the fair value measurement of assets and liabilities classified as Level 3 are as follows:

    September 30, 2013
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Retail natural gas sales contracts (b) $ 35 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 13% - 100% (80%)
 Heat rate call options (d)   9 Discounted cash flow Implied correlation, implied volatility, and market implied heat rate 33% - 60% (58%)
 FTR purchase contracts (g)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
           
Auction rate securities (e)   19 Discounted cash flow Modeled from SIFMA Index 12% - 80% (64%)
           
              
PPL Energy Supply            
Energy commodities            
 Retail natural gas sales contracts (b) $ 35 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 13% - 100% (80%)
 Heat rate call options (d)   9 Discounted cash flow Implied correlation, implied volatility, and market implied heat rate 33% - 60% (58%)
 FTR purchase contracts (g)   3 Discounted cash flow Historical settled prices used to model forward prices 100% (100%)
           
Auction rate securities (e)   16 Discounted cash flow Modeled from SIFMA Index 12% - 80% (63%)

    December 31, 2012
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Retail natural gas sales contracts (b) $ 24 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 21% - 100% (75%)
 Power sales contracts (c)   (4) Discounted cash flow Proprietary model used to calculate forward basis prices  24% (24%)
 FTR purchase contracts (g)   2 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
           
Auction rate securities (e)   16 Discounted cash flow Modeled from SIFMA Index 54% - 74% (64%)
           
Cross-currency swaps (f)   1 Discounted cash flow Credit valuation adjustment  22% (22%)
              
PPL Energy Supply            
Energy commodities            
 Retail natural gas sales contracts (b) $ 24 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 21% - 100% (75%)
 Power sales contracts (c)   (4) Discounted cash flow Proprietary model used to calculate forward basis prices  24% (24%)
 FTR purchase contracts (g)    2 Discounted cash flow Historical settled prices used to model forward prices 100% (100%)
           
Auction rate securities (e)   13 Discounted cash flow Modeled from SIFMA Index 57% - 74% (65%)

(a)       For energy commodities and auction rate securities, the range and weighted average represent the percentage of fair value derived from the unobservable inputs. For cross-currency swaps, the range and weighted average represent the percentage decrease in fair value due to the unobservable inputs used in the model to calculate the credit valuation adjustment.

(b)       At September 30, 2013, retail natural gas sales contracts extend through 2019, and $14 million of the fair value is scheduled to deliver within the next 12 months. As the forward price of natural gas increases/(decreases), the fair value of the contracts (decreases)/increases.

(c)       As the forward price of basis increases/(decreases), the fair value of the contracts (decreases)/increases.

(d)       At September 30, 2013, heat rate call options extend through 2020, and $1 million of the fair value is scheduled to deliver within the next 12 months. As the implied correlation in heat rate call options increases/(decreases), the fair value of the heat rate call options (decreases)/increases, as all implied volatilities in heat rate call options increase/(decrease), the fair value of the heat rate call options increases/(decreases), and as the market implied heat rate increases/(decreases), the fair value of the heat rate call options increases/(decreases).

(e)       At September 30, 2013, auction rate securities have a weighted average contractual maturity of 22 years. The model used to calculate fair value incorporates an assumption that the auctions will continue to fail. As the modeled forward rates of the SIFMA Index increase/(decrease), the fair value of the securities increases/(decreases).

(f)       The credit valuation adjustment incorporates projected probabilities of default and estimated recovery rates. As the credit valuation adjustment increases/(decreases), the fair value of the swaps (decreases)/increases.

(g)       At September 30, 2013, FTR purchase contracts extend through 2015, and $1 million of the fair value is scheduled to deliver within the next 12 months. As the forward implied spread increases/(decreases), the fair value of the contracts increases/(decreases).

Fair Value of Assets and Liabilities Classified as Level 3 Measured on Recurring Basis Included in Earnings

Net gains and losses on assets and liabilities classified as Level 3 and included in earnings for the periods ended September 30 are reported in the Statements of Income as follows:

   Three Months
                                
   Energy Commodities, net
            
   Unregulated Wholesale      
   Retail Energy Net Energy   Energy
   Electric and Gas Marketing Trading Margins Fuel Purchases
   2013 2012 2013 2012 2013 2012 2013 2012 2013 2012
PPL and PPL Energy Supply                        
                               
Total gains (losses) included in earnings  $ 3 $ (3) $ (8) $ (4) $ 11 $ (8) $ 3    $ 9 $ (2)
Change in unrealized gains (losses) relating                               
 to positions still held at the reporting date   3   (2)      (1)   17   2            

   Nine Months
                                 Cross-Currency
   Energy Commodities, net Swaps
              
   Unregulated Wholesale                         
   Retail Energy Net Energy   Energy  
   Electric and Gas Marketing Trading Margins Fuel Purchases Interest Expense
   2013 2012 2013 2012 2013 2012 2013 2012 2013 2012 2013 2012
PPL                                 
Total gains (losses) included                                    
 in earnings $ 18 $ 16 $ (15) $ (7) $ 8 $ (9) $ 3    $ 9 $ (1)    $ (1)
Change in unrealized gains                                     
 (losses) relating to positions                                     
 still held at the reporting date   18   29   (1)      8   2         5   1      
                                      
PPL Energy Supply                                    
Total gains (losses) included                                    
 in earnings $ 18 $ 16 $ (15) $ (7) $ 8 $ (9) $ 3    $ 9 $ (1)      
Change in unrealized gains                                     
 (losses) relating to positions                                     
 still held at the reporting date   18   29   (1)      8   2         5   1      
                                      
Fair Value of Financial Instruments Not Recorded at Fair Value - Other

The carrying amounts of contract adjustment payments related to the Purchase Contract component of the Equity Units and long-term debt on the Balance Sheets and their estimated fair values are set forth below.

   September 30, 2013 December 31, 2012
   Carrying    Carrying   
   Amount Fair Value Amount Fair Value
PPL            
 Contract adjustment payments (a) $ 32 $ 32 $ 105 $ 106
 Long-term debt    19,843   21,537   19,476   21,671
PPL Energy Supply            
 Long-term debt    2,962   3,127   3,272   3,556
PPL Electric            
 Long-term debt    2,315   2,505   1,967   2,333

LKE             
 Long-term debt    4,076   4,222   4,075   4,423
LG&E            
 Long-term debt    1,112   1,137   1,112   1,178
KU            
 Long-term debt    1,843   1,940   1,842   2,056

(a)       Reflected in "Other current liabilities" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.

PPL Energy Supply LLC [Member]
  
Fair Value Measurements and Credit Concentration [Line Items]  
Reconciliation of Net Assets and Liabilities Classified as Level 3
A reconciliation of net assets and liabilities classified as Level 3 for the periods ended September 30, 2013 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Three Months Nine Months
      Energy  Auction  Cross-    Energy  Auction Cross-   
      Commodities, Rate  Currency    Commodities,  Rate  Currency   
       net Securities Swaps Total  net Securities Swaps Total
PPL                        
Balance at beginning of                        
 period $ 40 $ 19 $ 3 $ 62 $ 22 $ 16 $ 1 $ 39
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   18         18   23         23
    Included in OCI (a)         (2)   (2)         1   1
  Sales               (2)         (2)
  Settlements   (2)         (2)   1         1
  Transfers into Level 3   (7)         (7)   1   3   3   7
  Transfers out of Level 3   (2)      (1)   (3)   2      (5)   (3)
Balance at end of period $ 47 $ 19 $  $ 66 $ 47 $ 19 $  $66
                             
PPL Energy Supply                        
Balance at beginning of                         
 period $ 40 $ 16    $ 56 $ 22 $ 13    $ 35
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   18         18   23         23
  Sales               (2)         (2)
  Settlements   (2)         (2)   1         1
  Transfers into Level 3   (7)         (7)   1   3      4
  Transfers out of Level 3   (2)         (2)   2         2
Balance at end of period $ 47 $ 16    $ 63 $ 47 $ 16    $ 63

(a)       "Energy Commodities, net" and "Cross-Currency Swaps" are included in "Qualifying derivatives" and "Auction Rate Securities" are included in "Available-for-sale securities" on the Statements of Comprehensive Income.

A reconciliation of net assets and liabilities classified as Level 3 for the periods ended September 30, 2012 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Three Months Nine Months
      Energy  Auction  Cross-    Energy  Auction Cross-   
      Commodities, Rate  Currency    Commodities,  Rate  Currency   
       net Securities Swaps Total  net Securities Swaps Total
PPL                        
Balance at beginning of                         
 period $ 34 $ 15 $ 10 $ 59 $ 13 $ 24 $ 4 $ 41
  Total realized/unrealized                        
   gains (losses)                        
    Included in earnings   (17)         (17)   (1)      (1)   (2)
    Included in OCI (a)      1   (8)   (7)   1      2   3
  Sales                  (5)      (5)
  Settlements   2         2   (9)         (9)
  Transfers into Level 3   (2)         (2)   12         12
  Transfers out of Level 3   8         8   9   (3)   (3)   3
Balance at end of period $ 25 $ 16 $ 2 $ 43 $ 25 $ 16 $ 2 $ 43
                             
PPL Energy Supply                        
Balance at beginning of                        
 period $ 34 $ 12    $ 46 $ 13 $ 19    $ 32
  Total realized/unrealized                        
   gains (losses)                        
    Included in earnings   (17)         (17)   (1)         (1)
    Included in OCI (a)      1      1   1         1
  Sales                  (3)      (3)
  Settlements   2         2   (9)         (9)
  Transfers into Level 3   (2)         (2)   12         12
  Transfers out of Level 3   8         8   9   (3)      6
Balance at end of period $ 25 $ 13    $ 38 $ 25 $ 13    $ 38

(a)       "Energy Commodities, net" and "Cross-Currency Swaps" are included in "Qualifying derivatives" and "Auction Rate Securities" are included in "Available-for-sale securities" on the Statements of Comprehensive Income.

Significant Unobservable Inputs Used in Fair Value Measurement of Assets and Liabilities Classified as Level 3

The significant unobservable inputs used in and quantitative information about the fair value measurement of assets and liabilities classified as Level 3 are as follows:

    September 30, 2013
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Retail natural gas sales contracts (b) $ 35 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 13% - 100% (80%)
 Heat rate call options (d)   9 Discounted cash flow Implied correlation, implied volatility, and market implied heat rate 33% - 60% (58%)
 FTR purchase contracts (g)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
           
Auction rate securities (e)   19 Discounted cash flow Modeled from SIFMA Index 12% - 80% (64%)
           
              
PPL Energy Supply            
Energy commodities            
 Retail natural gas sales contracts (b) $ 35 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 13% - 100% (80%)
 Heat rate call options (d)   9 Discounted cash flow Implied correlation, implied volatility, and market implied heat rate 33% - 60% (58%)
 FTR purchase contracts (g)   3 Discounted cash flow Historical settled prices used to model forward prices 100% (100%)
           
Auction rate securities (e)   16 Discounted cash flow Modeled from SIFMA Index 12% - 80% (63%)

    December 31, 2012
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Retail natural gas sales contracts (b) $ 24 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 21% - 100% (75%)
 Power sales contracts (c)   (4) Discounted cash flow Proprietary model used to calculate forward basis prices  24% (24%)
 FTR purchase contracts (g)   2 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
           
Auction rate securities (e)   16 Discounted cash flow Modeled from SIFMA Index 54% - 74% (64%)
           
Cross-currency swaps (f)   1 Discounted cash flow Credit valuation adjustment  22% (22%)
              
PPL Energy Supply            
Energy commodities            
 Retail natural gas sales contracts (b) $ 24 Discounted cash flow Observable wholesale prices used as proxy for retail delivery points 21% - 100% (75%)
 Power sales contracts (c)   (4) Discounted cash flow Proprietary model used to calculate forward basis prices  24% (24%)
 FTR purchase contracts (g)    2 Discounted cash flow Historical settled prices used to model forward prices 100% (100%)
           
Auction rate securities (e)   13 Discounted cash flow Modeled from SIFMA Index 57% - 74% (65%)

(a)       For energy commodities and auction rate securities, the range and weighted average represent the percentage of fair value derived from the unobservable inputs. For cross-currency swaps, the range and weighted average represent the percentage decrease in fair value due to the unobservable inputs used in the model to calculate the credit valuation adjustment.

(b)       At September 30, 2013, retail natural gas sales contracts extend through 2019, and $14 million of the fair value is scheduled to deliver within the next 12 months. As the forward price of natural gas increases/(decreases), the fair value of the contracts (decreases)/increases.

(c)       As the forward price of basis increases/(decreases), the fair value of the contracts (decreases)/increases.

(d)       At September 30, 2013, heat rate call options extend through 2020, and $1 million of the fair value is scheduled to deliver within the next 12 months. As the implied correlation in heat rate call options increases/(decreases), the fair value of the heat rate call options (decreases)/increases, as all implied volatilities in heat rate call options increase/(decrease), the fair value of the heat rate call options increases/(decreases), and as the market implied heat rate increases/(decreases), the fair value of the heat rate call options increases/(decreases).

(e)       At September 30, 2013, auction rate securities have a weighted average contractual maturity of 22 years. The model used to calculate fair value incorporates an assumption that the auctions will continue to fail. As the modeled forward rates of the SIFMA Index increase/(decrease), the fair value of the securities increases/(decreases).

(f)       The credit valuation adjustment incorporates projected probabilities of default and estimated recovery rates. As the credit valuation adjustment increases/(decreases), the fair value of the swaps (decreases)/increases.

(g)       At September 30, 2013, FTR purchase contracts extend through 2015, and $1 million of the fair value is scheduled to deliver within the next 12 months. As the forward implied spread increases/(decreases), the fair value of the contracts increases/(decreases).

Fair Value of Assets and Liabilities Classified as Level 3 Measured on Recurring Basis Included in Earnings

Net gains and losses on assets and liabilities classified as Level 3 and included in earnings for the periods ended September 30 are reported in the Statements of Income as follows:

   Three Months
                                
   Energy Commodities, net
            
   Unregulated Wholesale      
   Retail Energy Net Energy   Energy
   Electric and Gas Marketing Trading Margins Fuel Purchases
   2013 2012 2013 2012 2013 2012 2013 2012 2013 2012
PPL and PPL Energy Supply                        
                               
Total gains (losses) included in earnings  $ 3 $ (3) $ (8) $ (4) $ 11 $ (8) $ 3    $ 9 $ (2)
Change in unrealized gains (losses) relating                               
 to positions still held at the reporting date   3   (2)      (1)   17   2            

   Nine Months
                                 Cross-Currency
   Energy Commodities, net Swaps
              
   Unregulated Wholesale                         
   Retail Energy Net Energy   Energy  
   Electric and Gas Marketing Trading Margins Fuel Purchases Interest Expense
   2013 2012 2013 2012 2013 2012 2013 2012 2013 2012 2013 2012
PPL                                 
Total gains (losses) included                                    
 in earnings $ 18 $ 16 $ (15) $ (7) $ 8 $ (9) $ 3    $ 9 $ (1)    $ (1)
Change in unrealized gains                                     
 (losses) relating to positions                                     
 still held at the reporting date   18   29   (1)      8   2         5   1      
                                      
PPL Energy Supply                                    
Total gains (losses) included                                    
 in earnings $ 18 $ 16 $ (15) $ (7) $ 8 $ (9) $ 3    $ 9 $ (1)      
Change in unrealized gains                                     
 (losses) relating to positions                                     
 still held at the reporting date   18   29   (1)      8   2         5   1