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Fair Value Measurements and Credit Concentration (Tables)
12 Months Ended
Dec. 31, 2012
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:

     December 31, 2012 December 31, 2011
     Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3
PPL                        
Assets                        
 Cash and cash equivalents  $ 901 $ 901       $ 1,202 $ 1,202      
 Restricted cash and cash equivalents (a)   135   135         209   209      
 Price risk management assets:                        
  Energy commodities   2,068   2 $ 2,037 $ 29   3,423   3 $ 3,390 $ 30
  Interest rate swaps   15      15      3      3   
  Foreign currency contracts               18      18   
  Cross-currency swaps   14      13   1   24      20   4
 Total price risk management assets   2,097   2   2,065   30   3,468   3   3,431   34
 NDT funds:                        
  Cash and cash equivalents   11   11         12   12      
  Equity securities                        
   U.S. large-cap   412   308   104      357   267   90   
   U.S. mid/small-cap   60   25   35      52   22   30   
  Debt securities                        
   U.S. Treasury   95   95         86   86      
   U.S. government sponsored agency   9      9      10      10   
   Municipality   82      82      83      83   
   Investment-grade corporate   40      40      38      38   
   Other   3      3      2      2   
  Receivables (payables), net      (2)   2         (3)   3   
 Total NDT funds   712   437   275      640   384   256   
 Auction rate securities (b)   19      3   16   24         24
Total assets $ 3,864 $ 1,475 $ 2,343 $ 46 $ 5,543 $ 1,798 $ 3,687 $ 58
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,566 $ 2 $ 1,557 $ 7 $ 2,345   1 $ 2,327 $ 17
  Interest rate swaps   80      80      63      63   
  Foreign currency contracts   44      44               
  Cross-currency swaps   4      4      2      2   
 Total price risk management liabilities $ 1,694 $ 2 $ 1,685 $ 7 $ 2,410   1 $ 2,392 $ 17
                            
PPL Energy Supply                        
Assets                        
 Cash and cash equivalents $ 413 $ 413       $ 379 $ 379      
 Restricted cash and cash equivalents (a)   63   63         145   145      
 Price risk management assets:                        
  Energy commodities   2,068   2 $ 2,037 $ 29   3,423   3 $ 3,390 $ 30
 Total price risk management assets   2,068   2   2,037   29   3,423   3   3,390   30
 NDT funds:                        
  Cash and cash equivalents   11   11         12   12      
  Equity securities                        
   U.S. large-cap   412   308   104      357   267   90   
   U.S. mid/small-cap   60   25   35      52   22   30   
  Debt securities                        
   U.S. Treasury   95   95         86   86      
   U.S. government sponsored agency   9      9      10      10   
   Municipality   82      82      83      83   
   Investment-grade corporate   40      40      38      38   
   Other   3      3      2      2   
  Receivables (payables), net      (2)   2         (3)   3   
 Total NDT funds   712   437   275      640   384   256   
 Auction rate securities (b)   16      3   13   19         19
Total assets $ 3,272 $ 915 $ 2,315 $ 42 $ 4,606 $ 911 $ 3,646 $ 49
                            
Liabilities                        
 Price risk management liabilities:                        
  Energy commodities $ 1,566 $ 2 $ 1,557 $ 7 $ 2,345 $ 1 $ 2,327 $ 17
 Total price risk management liabilities $ 1,566 $ 2 $ 1,557 $ 7 $ 2,345 $ 1 $ 2,327 $ 17
                            
PPL Electric                        
Assets                        
 Cash and cash equivalents $ 140 $ 140       $ 320 $ 320      
 Restricted cash and cash equivalents (c)   13   13         13   13      
Total assets $ 153 $ 153       $ 333 $ 333      

LKE                        
Assets                        
 Cash and cash equivalents  $ 43 $ 43       $ 59 $ 59      
 Restricted cash and cash equivalents (d)   32   32         29   29      
 Price risk management assets:                        
  Interest rate swaps   14    $ 14               
 Total price risk management assets   14      14               
Total assets $ 89 $ 75 $ 14    $ 88 $ 88      
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps (e) $ 58    $ 58    $ 60    $ 60   
 Total price risk management liabilities $ 58    $ 58    $ 60    $ 60   
                            
LG&E                        
Assets                        
 Cash and cash equivalents $ 22 $ 22       $ 25 $ 25      
 Restricted cash and cash equivalents (d)   32   32         29   29      
 Price risk management assets:                        
  Interest rate swaps   7    $ 7               
 Total price risk management assets   7      7               
Total assets $ 61 $ 54 $ 7    $ 54 $ 54      
                            
Liabilities                        
 Price risk management liabilities:                        
  Interest rate swaps (e) $ 58    $ 58    $ 60    $ 60   
 Total price risk management liabilities $ 58    $ 58    $ 60    $ 60   
                            
KU                        
Assets                        
 Cash and cash equivalents $ 21 $ 21       $ 31 $ 31      
 Price risk management assets:                        
  Interest rate swaps   7    $ 7               
 Total price risk management assets   7      7               
Total assets $ 28 $ 21 $ 7    $ 31 $ 31      

(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 the long-term portion is included in "Other noncurrent assets" on the Balance Sheets.

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

(e)       Current portion is included in "Other current liabilities" on the Balance Sheets.  The long-term portion is included in "Price risk management liabilities" 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 years ended is as follows:
                 
      PPL
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Energy  Auction  Cross-   
      Commodities, Rate  Currency   
       net Securities Swaps Total
December 31, 2012            
Balance at beginning of period $ 13 $ 24 $ 4 $ 41
  Total realized/unrealized gains (losses)            
    Included in earnings   2      (1)   1
    Included in OCI (a)   1      1   2
  Sales      (5)      (5)
  Settlements   (13)         (13)
  Transfers into Level 3   8         8
  Transfers out of Level 3   11   (3)   (3)   5
Balance at end of period $ 22 $ 16 $ 1 $ 39
                 
December 31, 2011            
Balance at beginning of period $ (3) $ 25    $ 22
  Total realized/unrealized gains (losses)            
    Included in earnings   (65)         (65)
    Included in OCI (a)   (1)   (1) $ (10)   (12)
  Purchases   1         1
  Sales   (3)         (3)
  Settlements   20         20
  Transfers into Level 3   (10)      14   4
  Transfers out of Level 3   74         74
Balance at end of period $ 13 $ 24 $ 4 $ 41

(a)       "Energy Commodities" 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 the fair value measurement of assets and liabilities classified as Level 3 at December 31, 2012 are as follows:

   Quantitative Information about Level 3 Fair Value Measurements
   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 (d)  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 (d)  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)       Retail natural gas sales contracts extend into 2017. $11 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)       Power sales contracts extend into 2014. $(4) million of the fair value is scheduled to deliver within the next 12 months. As the forward price of basis increases/(decreases), the fair value of the contracts (decreases)/increases.

(d)       FTR purchase contracts extend into 2015. $2 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).

(e)       Auction rate securities have a weighted average contractual maturity of 23 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)       Cross-currency swaps extend into 2017. 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.

The significant unobservable inputs used in the nonrecurring fair value measurement of assets and liabilities classified as Level 3 at December 31, 2012 are as follows:
             
   Quantitative Information about Level 3 Fair Value Measurements
   Fair Value, net     Range
   Asset Valuation  Unobservable (Weighted
   (Liability) Technique Input(s) Average)
PPL, LKE, and KU           
          
Equity investment in EEI $ Discounted cash flow  Long-term forward price curves and capital expenditure projections 100% (100%)
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 years ended December 31 were reported in the Statements of Income as follows:

    Cross-Currency
  Energy Commodities, net Swaps
               
  Unregulated Retail Wholesale Energy Net Energy  Energy Interest
  Electric and Gas Marketing Trading Margins Purchases Expense
  2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
PPL                              
Total gains (losses) included in earnings $26 $32 $ (7)    $ (12) $ (1) $ (5) $ (96) $ (1)   
Change in unrealized gains (losses) relating to                              
 positions still held at the reporting date  29  23   (4) $ 5   1   1   1   (2)      
                                
PPL Energy Supply                              
Total gains (losses) included in earnings  26  32   (7)      (12)   (1)   (5)   (96)      
Change in unrealized gains (losses) relating to                              
 positions still held at the reporting date  29  23   (4)   5   1  1   1   (2)      
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

The following nonrecurring fair value measurements occurred during the reporting periods, resulting in asset impairments.

     Carrying Fair Value Measurements Using   
    Amount (a) Level 2 Level 3 Loss (b)
PPL, LKE and KU            
 Equity investment in EEI:            
  December 31, 2012 $ 25       $ 25
PPL and PPL Energy Supply            
 Sulfur dioxide emission allowances (c):            
  December 31, 2010   2    $ 1   1
  September 30, 2010   6      2   4
  June 30, 2010   11      3   8
  March 31, 2010   13      10   3
 RECs (c):            
  September 30, 2011   1         1
  June 30, 2011   2 $ 1      1
  March 31, 2011   3         3
 Certain non-core generation facilities:            
  September 30, 2010   473   381      96

(a)       Represents carrying value before fair value measurement.

(b)       The loss on the EEI investment was recorded in the Kentucky Regulated segment and included in "Other-Than-Temporary Impairments" on the Statement of Income. Losses on sulfur dioxide emission allowances and RECs were recorded in the Supply segment and included in "Other operation and maintenance" on the Statements of Income. Losses on certain non-core generation facilities were recorded in the Supply segment and included in "Income (Loss) from Discontinued Operations (net of income taxes)" on the Statement of Income.

(c)       Current and long-term sulfur dioxide emission allowances and RECs are included in "Other current assets" and "Other intangibles" in their respective areas on the Balance Sheets.

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.

   December 31, 2012 December 31, 2011
   Carrying    Carrying   
   Amount Fair Value Amount Fair Value
PPL            
 Contract adjustment payments (a) $ 105 $ 106 $ 198 $ 198
 Long-term debt    19,476   21,671   17,993   19,392
PPL Energy Supply            
 Long-term debt    3,272   3,556   3,024   3,397
PPL Electric            
 Long-term debt    1,967   2,333   1,718   2,012

LKE             
 Long-term debt    4,075   4,423   4,073   4,306
LG&E            
 Long-term debt    1,112   1,178   1,112   1,164
KU            
 Long-term debt    1,842   2,056   1,842   2,000

(a)       Included 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 years ended is as follows:
              
      PPL Energy Supply
      Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
      Energy  Auction    
      Commodities, Rate    
       net Securities Total
December 31, 2012         
Balance at beginning of period $ 13 $ 19 $ 32
  Total realized/unrealized gains (losses)         
    Included in earnings   2      2
    Included in OCI (a)   1      1
  Sales      (3)   (3)
  Settlements   (13)      (13)
  Transfers into Level 3   8      8
  Transfers out of Level 3   11   (3)   8
Balance at end of period $ 22 $ 13 $ 35
              
December 31, 2011         
Balance at beginning of period $ (3) $ 20 $ 17
  Total realized/unrealized gains (losses)         
    Included in earnings   (65)      (65)
    Included in OCI (a)   (1)   (1)   (2)
  Purchases   1      1
  Sales   (3)      (3)
  Settlements   20      20
  Transfers into Level 3   (10)      (10)
  Transfers out of Level 3   74      74
Balance at end of period $ 13 $ 19 $ 32

(a)       "Energy Commodities" 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 the fair value measurement of assets and liabilities classified as Level 3 at December 31, 2012 are as follows:

   Quantitative Information about Level 3 Fair Value Measurements
   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 (d)  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 (d)  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)       Retail natural gas sales contracts extend into 2017. $11 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)       Power sales contracts extend into 2014. $(4) million of the fair value is scheduled to deliver within the next 12 months. As the forward price of basis increases/(decreases), the fair value of the contracts (decreases)/increases.

(d)       FTR purchase contracts extend into 2015. $2 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).

(e)       Auction rate securities have a weighted average contractual maturity of 23 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).

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 years ended December 31 were reported in the Statements of Income as follows:

    Cross-Currency
  Energy Commodities, net Swaps
               
  Unregulated Retail Wholesale Energy Net Energy  Energy Interest
  Electric and Gas Marketing Trading Margins Purchases Expense
  2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
PPL                              
Total gains (losses) included in earnings $26 $32 $ (7)    $ (12) $ (1) $ (5) $ (96) $ (1)   
Change in unrealized gains (losses) relating to                              
 positions still held at the reporting date  29  23   (4) $ 5   1   1   1   (2)      
                                
PPL Energy Supply                              
Total gains (losses) included in earnings  26  32   (7)      (12)   (1)   (5)   (96)      
Change in unrealized gains (losses) relating to                              
 positions still held at the reporting date  29  23   (4)   5   1  1   1   (2)      
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

The following nonrecurring fair value measurements occurred during the reporting periods, resulting in asset impairments.

     Carrying Fair Value Measurements Using   
    Amount (a) Level 2 Level 3 Loss (b)
PPL, LKE and KU            
 Equity investment in EEI:            
  December 31, 2012 $ 25       $ 25
PPL and PPL Energy Supply            
 Sulfur dioxide emission allowances (c):            
  December 31, 2010   2    $ 1   1
  September 30, 2010   6      2   4
  June 30, 2010   11      3   8
  March 31, 2010   13      10   3
 RECs (c):            
  September 30, 2011   1         1
  June 30, 2011   2 $ 1      1
  March 31, 2011   3         3
 Certain non-core generation facilities:            
  September 30, 2010   473   381      96

(a)       Represents carrying value before fair value measurement.

(b)       The loss on the EEI investment was recorded in the Kentucky Regulated segment and included in "Other-Than-Temporary Impairments" on the Statement of Income. Losses on sulfur dioxide emission allowances and RECs were recorded in the Supply segment and included in "Other operation and maintenance" on the Statements of Income. Losses on certain non-core generation facilities were recorded in the Supply segment and included in "Income (Loss) from Discontinued Operations (net of income taxes)" on the Statement of Income.

(c)       Current and long-term sulfur dioxide emission allowances and RECs are included in "Other current assets" and "Other intangibles" in their respective areas on the Balance Sheets.

LG And E And KU Energy LLC [Member]
 
Fair Value Measurements and Credit Concentration [Line Items]  
Significant Unobservable Inputs Used in Fair Value Measurement of Assets and Liabilities Classified as Level 3
The significant unobservable inputs used in the nonrecurring fair value measurement of assets and liabilities classified as Level 3 at December 31, 2012 are as follows:
             
   Quantitative Information about Level 3 Fair Value Measurements
   Fair Value, net     Range
   Asset Valuation  Unobservable (Weighted
   (Liability) Technique Input(s) Average)
PPL, LKE, and KU           
          
Equity investment in EEI $ Discounted cash flow  Long-term forward price curves and capital expenditure projections 100% (100%)
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

The following nonrecurring fair value measurements occurred during the reporting periods, resulting in asset impairments.

     Carrying Fair Value Measurements Using   
    Amount (a) Level 2 Level 3 Loss (b)
PPL, LKE and KU            
 Equity investment in EEI:            
  December 31, 2012 $ 25       $ 25
PPL and PPL Energy Supply            
 Sulfur dioxide emission allowances (c):            
  December 31, 2010   2    $ 1   1
  September 30, 2010   6      2   4
  June 30, 2010   11      3   8
  March 31, 2010   13      10   3
 RECs (c):            
  September 30, 2011   1         1
  June 30, 2011   2 $ 1      1
  March 31, 2011   3         3
 Certain non-core generation facilities:            
  September 30, 2010   473   381      96
Kentucky Utilities Co [Member]
 
Fair Value Measurements and Credit Concentration [Line Items]  
Significant Unobservable Inputs Used in Fair Value Measurement of Assets and Liabilities Classified as Level 3
The significant unobservable inputs used in the nonrecurring fair value measurement of assets and liabilities classified as Level 3 at December 31, 2012 are as follows:
             
   Quantitative Information about Level 3 Fair Value Measurements
   Fair Value, net     Range
   Asset Valuation  Unobservable (Weighted
   (Liability) Technique Input(s) Average)
PPL, LKE, and KU           
          
Equity investment in EEI $ Discounted cash flow  Long-term forward price curves and capital expenditure projections 100% (100%)
Fair Value of Assets and Liabilities Measured on Nonrecurring Basis

The following nonrecurring fair value measurements occurred during the reporting periods, resulting in asset impairments.

     Carrying Fair Value Measurements Using   
    Amount (a) Level 2 Level 3 Loss (b)
PPL, LKE and KU            
 Equity investment in EEI:            
  December 31, 2012 $ 25       $ 25
PPL and PPL Energy Supply            
 Sulfur dioxide emission allowances (c):            
  December 31, 2010   2    $ 1   1
  September 30, 2010   6      2   4
  June 30, 2010   11      3   8
  March 31, 2010   13      10   3
 RECs (c):            
  September 30, 2011   1         1
  June 30, 2011   2 $ 1      1
  March 31, 2011   3         3
 Certain non-core generation facilities:            
  September 30, 2010   473   381      96