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Fair Value Measurements and Credit Concentration (Tables)
 3 Months Ended
Mar. 31, 2014
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:

     March 31, 2014 December 31, 2013
     Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3
PPL                        
Assets                        
 Cash and cash equivalents  $ 1,256 $ 1,256       $ 1,102 $ 1,102      
 Restricted cash and cash equivalents (a)   491   491         156   156      
 Price risk management assets:                        
  Energy commodities   1,417   2 $ 1,330 $ 85   1,188   3 $ 1,123 $ 62
  Interest rate swaps   9      9      91      91   
  Foreign currency contracts   5      5               
 Total price risk management assets   1,431   2   1,344   85   1,279   3   1,214   62
 NDT funds:                        
  Cash and cash equivalents   13   13         14   14      
  Equity securities                        
   U.S. large-cap   556   415   141      547   409   138   
   U.S. mid/small-cap   83   34   49      81   33   48   
  Debt securities                        
   U.S. Treasury   95   95         95   95      
   U.S. government sponsored agency   6      6      6      6   
   Municipality   80      80      77      77   
   Investment-grade corporate   41      41      38      38   
   Other   4      4      5      5   
  Receivables (payables), net   1   (1)   2      1   (1)   2   
 Total NDT funds   879   556   323      864   550   314   
 Auction rate securities (b)   16         16   19         19
Total assets $ 4,073 $ 2,305 $ 1,667 $ 101 $ 3,420 $ 1,811 $ 1,528 $ 81
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,527 $ 1 $ 1,458 $ 68 $ 1,070 $ 4 $ 1,028 $ 38
  Interest rate swaps   47      47      36      36   
  Foreign currency contracts   123      123      106      106   
  Cross-currency swaps   55      55      32      32   
 Total price risk management liabilities $ 1,752 $ 1 $ 1,683 $ 68 $ 1,244 $ 4 $ 1,202 $ 38
                            
PPL Energy Supply                        
Assets                        
 Cash and cash equivalents $ 441 $ 441       $ 239 $ 239      
 Restricted cash and cash equivalents (a)   429   429         85   85      
 Price risk management assets:                        
  Energy commodities   1,417   2 $ 1,330 $ 85   1,188   3 $ 1,123 $ 62
 Total price risk management assets   1,417   2   1,330   85   1,188   3   1,123   62
 NDT funds:                        
  Cash and cash equivalents   13   13         14   14      
  Equity securities                        
   U.S. large-cap   556   415   141      547   409   138   
   U.S. mid/small-cap   83   34   49      81   33   48   
  Debt securities                        
   U.S. Treasury   95   95         95   95      
   U.S. government sponsored agency   6      6      6      6   
   Municipality   80      80      77      77   
   Investment-grade corporate   41      41      38      38   
   Other   4      4      5      5   
  Receivables (payables), net   1   (1)   2      1   (1)   2   
 Total NDT funds   879   556   323      864   550   314   
 Auction rate securities (b)   13         13   16         16
Total assets $ 3,179 $ 1,428 $ 1,653 $ 98 $ 2,392 $ 877 $ 1,437 $ 78
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,527 $ 1 $ 1,458 $ 68 $ 1,070 $ 4 $ 1,028 $ 38
 Total price risk management liabilities $ 1,527 $ 1 $ 1,458 $ 68 $ 1,070 $ 4 $ 1,028 $ 38
                            
PPL Electric                        
Assets                        
 Cash and cash equivalents $ 42 $ 42       $ 25 $ 25      
 Restricted cash and cash equivalents (c)   1   1         12   12      
Total assets $ 43 $ 43       $ 37 $ 37      

LKE                        
Assets                        
 Cash and cash equivalents  $ 30 $ 30       $ 35 $ 35      
 Restricted cash and cash equivalents (d)   21   21         22   22      
Total assets $ 51 $ 51       $ 57 $ 57      
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps  $ 40    $ 40    $ 36    $ 36   
Total price risk management liabilities $ 40    $ 40    $ 36    $ 36   
                            
LG&E                        
Assets                        
 Cash and cash equivalents $ 9 $ 9       $ 8 $ 8      
 Restricted cash and cash equivalents (d)   21   21         22   22      
Total assets $ 30 $ 30       $ 30 $ 30      
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps  $ 40    $ 40    $ 36    $ 36   
Total price risk management liabilities $ 40    $ 40    $ 36    $ 36   
                            
KU                        
Assets                        
 Cash and cash equivalents $ 21 $ 21       $ 21 $ 21      
Total assets $ 21 $ 21       $ 21 $ 21      

(a)       Current portion is included in "Restricted cash and cash equivalents" and 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 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 three months ended March 31 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      2014 2013
      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 $ 24 $ 19    $ 43 $ 22 $ 16 $ 1 $ 39
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   (135)         (135)   (8)         (8)
    Included in OCI (a)       $ (1)   (1)         3   3
  Sales      (3)      (3)            
  Settlements   128         128   (1)         (1)
  Transfers into Level 3               1         1
  Transfers out of Level 3         1   1         (4)   (4)
Balance at end of period $ 17 $ 16 $  $ 33 $ 14 $ 16 $  $30
                             
PPL Energy Supply                        
Balance at beginning of                         
 period $ 24 $ 16    $ 40 $ 22 $ 13    $ 35
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   (135)         (135)   (8)         (8)
  Sales      (3)      (3)            
  Settlements   128         128   (1)         (1)
  Transfers into Level 3               1         1
Balance at end of period $ 17 $ 13    $ 30 $ 14 $ 13    $ 27

(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:

    March 31, 2014
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Natural gas contracts (b) $ 13 Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (73%)
 Power sales contracts (c)   (43) Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (83%)
 FTR purchase contracts (d)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
 Heat rate options (e)   44 Discounted cash flow Proprietary model used to calculate forward prices 23% - 59% (44%)
           
Auction rate securities (f)   16 Discounted cash flow Modeled from SIFMA Index 61% - 78% (70%)
           
              
PPL Energy Supply             
Energy commodities            
 Natural gas contracts (b) $ 13 Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (73%)
 Power sales contracts (c)   (43) Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (83%)
 FTR purchase contracts (d)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
 Heat rate options (e)   44 Discounted cash flow Proprietary model used to calculate forward prices 23% - 59% (44%)
           
Auction rate securities (f)   13 Discounted cash flow Modeled from SIFMA Index 63% - 78% (71%)

    December 31, 2013
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Natural gas contracts (b) $ 36 Discounted cash flow Proprietary model used to calculate forward prices 10% - 100% (86%)
 Power sales contracts (c)   (12) Discounted cash flow Proprietary model used to calculate forward prices 100% (100%)
           
Auction rate securities (f)   19 Discounted cash flow Modeled from SIFMA Index 10% - 80% (63%)
           
              
PPL Energy Supply            
Energy commodities            
 Natural gas contracts (b) $ 36 Discounted cash flow Proprietary model used to calculate forward prices 10% - 100% (86%)
 Power sales contracts (c)   (12) Discounted cash flow Proprietary model used to calculate forward prices 100% (100%)
           
Auction rate securities (f)   16 Discounted cash flow Modeled from SIFMA Index 10% - 80% (63%)

(a)       For energy commodities and auction rate securities, the range and weighted average represent the percentage of fair value derived from the unobservable inputs.

(b)       As the forward price of natural gas increases/(decreases), the fair value of the contracts (decreases)/increases.

(c)       As forward market prices increase/(decrease), the fair value of contracts (decreases)/increases. As volumetric assumptions for contracts in a gain position increase/(decrease), the fair value of contracts increases/(decreases). As volumetric assumptions for contracts in a loss position increase/(decrease), the fair value of the contracts (decreases)/increases.

(d)       As the forward implied spread increases/(decreases), the fair value of the contracts increases/(decreases).

(e)       The proprietary model used to calculate fair value incorporates market heat rates, correlations and volatilities. As the market implied heat rate increases/(decreases), the fair value of the contracts increases/(decreases).

(f)       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).

The significant unobservable inputs used in and the quantitative information about the nonrecurring fair value measurement of assets and liabilities classified as Level 3 are as follows:
             
    
   Fair Value, net   Significant Range
   Asset Valuation  Unobservable (Weighted
   (Liability) Technique Input(s) Average)(a)
             
PPL and PPL Energy Supply           
Kerr Dam Project           
 March 31, 2014$29 Discounted cash flow Proprietary model used to calculate plant value 38% (38%)

(a)       The range and weighted average represent the percentage of fair value derived from the unobservable inputs.

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 March 31 are reported in the Statements of Income as follows:

   Three Months
                    
   Energy Commodities, net
   Unregulated Unregulated Energy
   Wholesale Energy Retail Energy Purchases
   2014 2013 2014 2013 2014 2013
PPL and PPL Energy Supply                  
Total gains (losses) included in earnings $ (89) $ (2) $ (63) $ (7) $ 17 $ 1
Change in unrealized gains (losses) relating to                  
  positions still held at the reporting date   (13)   (2)   (33)   (7)   1   1
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

The following nonrecurring fair value measurement occurred during the three months ended March 31, 2014, resulting in an asset impairment:

    Carrying Fair Value Measurement Using   
   Amount (a) Level 3 Loss (b)
PPL and PPL Energy Supply         
Kerr Dam Project $ 47 $ 29 $ 18

(a)       Represents carrying value before fair value measurement.

(b)       The loss on the Kerr Dam Project was recorded in the Supply segment and included in "Other operation and maintenance" on PPL's and PPL Energy Supply's Statement of Income.  

Fair Value of Financial Instruments Not Recorded at Fair Value - Other

The carrying amounts of contract adjustment payments related to the 2011 Purchase Contract component of the 2011 Equity Units and long-term debt on the Balance Sheets and their estimated fair values are set forth below.

   March 31, 2014 December 31, 2013
   Carrying    Carrying   
   Amount Fair Value Amount Fair Value
PPL            
 Contract adjustment payments (a) $ 11 $ 11 $ 21 $ 22
 Long-term debt    20,818   22,350   20,907   22,177
PPL Energy Supply            
 Long-term debt    2,524   2,680   2,525   2,658
PPL Electric            
 Long-term debt    2,306   2,555   2,315   2,483

LKE             
 Long-term debt    4,565   4,807   4,565   4,672
LG&E            
 Long-term debt    1,353   1,413   1,353   1,372
KU            
 Long-term debt    2,091   2,238   2,091   2,155

(a)       Included in "Other current 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 three months ended March 31 is as follows:
                             
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      2014 2013
      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 $ 24 $ 19    $ 43 $ 22 $ 16 $ 1 $ 39
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   (135)         (135)   (8)         (8)
    Included in OCI (a)       $ (1)   (1)         3   3
  Sales      (3)      (3)            
  Settlements   128         128   (1)         (1)
  Transfers into Level 3               1         1
  Transfers out of Level 3         1   1         (4)   (4)
Balance at end of period $ 17 $ 16 $  $ 33 $ 14 $ 16 $  $30
                             
PPL Energy Supply                        
Balance at beginning of                         
 period $ 24 $ 16    $ 40 $ 22 $ 13    $ 35
  Total realized/unrealized                         
   gains (losses)                        
    Included in earnings   (135)         (135)   (8)         (8)
  Sales      (3)      (3)            
  Settlements   128         128   (1)         (1)
  Transfers into Level 3               1         1
Balance at end of period $ 17 $ 13    $ 30 $ 14 $ 13    $ 27

(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:

    March 31, 2014
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Natural gas contracts (b) $ 13 Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (73%)
 Power sales contracts (c)   (43) Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (83%)
 FTR purchase contracts (d)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
 Heat rate options (e)   44 Discounted cash flow Proprietary model used to calculate forward prices 23% - 59% (44%)
           
Auction rate securities (f)   16 Discounted cash flow Modeled from SIFMA Index 61% - 78% (70%)
           
              
PPL Energy Supply             
Energy commodities            
 Natural gas contracts (b) $ 13 Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (73%)
 Power sales contracts (c)   (43) Discounted cash flow Proprietary model used to calculate forward prices 11% - 100% (83%)
 FTR purchase contracts (d)   3 Discounted cash flow Historical settled prices used to model forward prices  100% (100%)
 Heat rate options (e)   44 Discounted cash flow Proprietary model used to calculate forward prices 23% - 59% (44%)
           
Auction rate securities (f)   13 Discounted cash flow Modeled from SIFMA Index 63% - 78% (71%)

    December 31, 2013
    Fair Value, net     Range
    Asset Valuation  Unobservable (Weighted
    (Liability) Technique Input(s) Average) (a)
PPL            
Energy commodities       
 Natural gas contracts (b) $ 36 Discounted cash flow Proprietary model used to calculate forward prices 10% - 100% (86%)
 Power sales contracts (c)   (12) Discounted cash flow Proprietary model used to calculate forward prices 100% (100%)
           
Auction rate securities (f)   19 Discounted cash flow Modeled from SIFMA Index 10% - 80% (63%)
           
              
PPL Energy Supply            
Energy commodities            
 Natural gas contracts (b) $ 36 Discounted cash flow Proprietary model used to calculate forward prices 10% - 100% (86%)
 Power sales contracts (c)   (12) Discounted cash flow Proprietary model used to calculate forward prices 100% (100%)
           
Auction rate securities (f)   16 Discounted cash flow Modeled from SIFMA Index 10% - 80% (63%)

(a)       For energy commodities and auction rate securities, the range and weighted average represent the percentage of fair value derived from the unobservable inputs.

(b)       As the forward price of natural gas increases/(decreases), the fair value of the contracts (decreases)/increases.

(c)       As forward market prices increase/(decrease), the fair value of contracts (decreases)/increases. As volumetric assumptions for contracts in a gain position increase/(decrease), the fair value of contracts increases/(decreases). As volumetric assumptions for contracts in a loss position increase/(decrease), the fair value of the contracts (decreases)/increases.

(d)       As the forward implied spread increases/(decreases), the fair value of the contracts increases/(decreases).

(e)       The proprietary model used to calculate fair value incorporates market heat rates, correlations and volatilities. As the market implied heat rate increases/(decreases), the fair value of the contracts increases/(decreases).

(f)       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).

The significant unobservable inputs used in and the quantitative information about the nonrecurring fair value measurement of assets and liabilities classified as Level 3 are as follows:
             
    
   Fair Value, net   Significant Range
   Asset Valuation  Unobservable (Weighted
   (Liability) Technique Input(s) Average)(a)
             
PPL and PPL Energy Supply           
Kerr Dam Project           
 March 31, 2014$29 Discounted cash flow Proprietary model used to calculate plant value 38% (38%)

(a)       The range and weighted average represent the percentage of fair value derived from the unobservable inputs.

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 March 31 are reported in the Statements of Income as follows:

   Three Months
                    
   Energy Commodities, net
   Unregulated Unregulated Energy
   Wholesale Energy Retail Energy Purchases
   2014 2013 2014 2013 2014 2013
PPL and PPL Energy Supply                  
Total gains (losses) included in earnings $ (89) $ (2) $ (63) $ (7) $ 17 $ 1
Change in unrealized gains (losses) relating to                  
  positions still held at the reporting date   (13)   (2)   (33)   (7)   1   1
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

Nonrecurring Fair Value Measurements (PPL and PPL Energy Supply)

 

The following nonrecurring fair value measurement occurred during the three months ended March 31, 2014, resulting in an asset impairment:

    Carrying Fair Value Measurement Using   
   Amount (a) Level 3 Loss (b)
PPL and PPL Energy Supply         
Kerr Dam Project $ 47 $ 29 $ 18

(a)       Represents carrying value before fair value measurement.

(b)       The loss on the Kerr Dam Project was recorded in the Supply segment and included in "Other operation and maintenance" on PPL's and PPL Energy Supply's Statement of Income.