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Utility Rate Regulation (Tables)
9 Months Ended
Sep. 30, 2013
Utility Rate Regulation [Line Items]  
Regulatory Assets and Liabilities

The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations.

   PPL PPL Electric
   September 30, December 31, September 30, December 31,
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 ECR $ 7         
 Gas supply clause   13 $ 11      
 Fuel adjustment clause      6      
 Other    11   2 $ 2   
Total current regulatory assets $ 31 $ 19 $ 2   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 683 $ 730 $ 345 $ 362
 Taxes recoverable through future rates   302   293   302   293
 Storm costs   152   168   55   59
 Unamortized loss on debt   88   96   58   65
 Interest rate swaps   49   67      
 Accumulated cost of removal of utility plant    95   71   95   71
 AROs   37   26      
 Other    17   32   2   3
Total noncurrent regulatory assets $ 1,423 $ 1,483 $ 857 $ 853

Current Regulatory Liabilities:            
 Generation supply charge  $ 21 $ 27 $ 21 $ 27
 ECR      4      
 Gas supply clause   2   4      
 Transmission service charge   9   6   9   6
 Transmission formula rate   9      9   
 Universal service rider   11   17   11   17
 Gas line tracker   6         
 Other    10   3   1   2
Total current regulatory liabilities $ 68 $ 61 $ 51 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 690 $ 679      
 Coal contracts (a)   108   141      
 Power purchase agreement - OVEC (a)   102   108      
 Net deferred tax assets   32   34      
 Act 129 compliance rider   14   8 $ 14 $ 8
 Defined benefit plans   18   17      
 Interest rate swaps   84   14      
 Other    6   9      
Total noncurrent regulatory liabilities $ 1,054 $ 1,010 $ 14 $ 8

(a)       These liabilities were recorded as offsets to certain intangible assets that were recorded at fair value upon the acquisition of LKE by PPL.

PPL Electric Utilities Corp [Member]
 
Utility Rate Regulation [Line Items]  
Regulatory Assets and Liabilities

The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations.

   PPL PPL Electric
   September 30, December 31, September 30, December 31,
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 ECR $ 7         
 Gas supply clause   13 $ 11      
 Fuel adjustment clause      6      
 Other    11   2 $ 2   
Total current regulatory assets $ 31 $ 19 $ 2   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 683 $ 730 $ 345 $ 362
 Taxes recoverable through future rates   302   293   302   293
 Storm costs   152   168   55   59
 Unamortized loss on debt   88   96   58   65
 Interest rate swaps   49   67      
 Accumulated cost of removal of utility plant    95   71   95   71
 AROs   37   26      
 Other    17   32   2   3
Total noncurrent regulatory assets $ 1,423 $ 1,483 $ 857 $ 853

Current Regulatory Liabilities:            
 Generation supply charge  $ 21 $ 27 $ 21 $ 27
 ECR      4      
 Gas supply clause   2   4      
 Transmission service charge   9   6   9   6
 Transmission formula rate   9      9   
 Universal service rider   11   17   11   17
 Gas line tracker   6         
 Other    10   3   1   2
Total current regulatory liabilities $ 68 $ 61 $ 51 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 690 $ 679      
 Coal contracts (a)   108   141      
 Power purchase agreement - OVEC (a)   102   108      
 Net deferred tax assets   32   34      
 Act 129 compliance rider   14   8 $ 14 $ 8
 Defined benefit plans   18   17      
 Interest rate swaps   84   14      
 Other    6   9      
Total noncurrent regulatory liabilities $ 1,054 $ 1,010 $ 14 $ 8
LG And E And KU Energy LLC [Member]
 
Utility Rate Regulation [Line Items]  
Regulatory Assets and Liabilities

The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations.

   LKE LG&E KU
   September 30, December 31, September 30, December 31, September 30, December 31,
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 ECR $ 7    $ 2    $ 5   
 Gas supply clause   13 $ 11   13 $ 11      
 Fuel adjustment clause      6      6      
 Other    9   2   4   2   5   
Total current regulatory assets $ 29 $ 19 $ 19 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 338 $ 368 $ 212 $ 232 $ 126 $ 136
 Storm costs   97   109   53   59   44   50
 Unamortized loss on debt    30   31   19   20   11   11
 Interest rate swaps   49   67   49   67      
 AROs   37   26   20   15   17   11
 Other    15   29   6   7   9   22
Total noncurrent regulatory assets $ 566 $ 630 $ 359 $ 400 $ 207 $ 230

Current Regulatory Liabilities:                  
  ECR    $ 4          $ 4
  Gas supply clause $ 2   4 $ 2 $ 4      
  Gas line tracker   6      6         
  Other    9   1   3    $ 6   1
Total current regulatory liabilities $ 17 $ 9 $ 11 $ 4 $ 6 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 690 $ 679 $ 300 $ 297 $ 390 $ 382
 Coal contracts (a)   108   141   47   61   61   80
 Power purchase agreement - OVEC (a)   102   108   71   75   31   33
 Net deferred tax assets   32   34   26   28   6   6
 Defined benefit plans   18   17         18   17
 Interest rate swaps   84   14   42   7   42   7
 Other    6   9   3   3   3   6
Total noncurrent regulatory liabilities $ 1,040 $ 1,002 $ 489 $ 471 $ 551 $ 531

(a)       These liabilities were recorded as offsets to certain intangible assets that were recorded at fair value upon the acquisition of LKE by PPL.

Louisville Gas And Electric Co [Member]
 
Utility Rate Regulation [Line Items]  
Regulatory Assets and Liabilities

The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations.

   LKE LG&E KU
   September 30, December 31, September 30, December 31, September 30, December 31,
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 ECR $ 7    $ 2    $ 5   
 Gas supply clause   13 $ 11   13 $ 11      
 Fuel adjustment clause      6      6      
 Other    9   2   4   2   5   
Total current regulatory assets $ 29 $ 19 $ 19 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 338 $ 368 $ 212 $ 232 $ 126 $ 136
 Storm costs   97   109   53   59   44   50
 Unamortized loss on debt    30   31   19   20   11   11
 Interest rate swaps   49   67   49   67      
 AROs   37   26   20   15   17   11
 Other    15   29   6   7   9   22
Total noncurrent regulatory assets $ 566 $ 630 $ 359 $ 400 $ 207 $ 230

Current Regulatory Liabilities:                  
  ECR    $ 4          $ 4
  Gas supply clause $ 2   4 $ 2 $ 4      
  Gas line tracker   6      6         
  Other    9   1   3    $ 6   1
Total current regulatory liabilities $ 17 $ 9 $ 11 $ 4 $ 6 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 690 $ 679 $ 300 $ 297 $ 390 $ 382
 Coal contracts (a)   108   141   47   61   61   80
 Power purchase agreement - OVEC (a)   102   108   71   75   31   33
 Net deferred tax assets   32   34   26   28   6   6
 Defined benefit plans   18   17         18   17
 Interest rate swaps   84   14   42   7   42   7
 Other    6   9   3   3   3   6
Total noncurrent regulatory liabilities $ 1,040 $ 1,002 $ 489 $ 471 $ 551 $ 531

(a)       These liabilities were recorded as offsets to certain intangible assets that were recorded at fair value upon the acquisition of LKE by PPL.

Kentucky Utilities Co [Member]
 
Utility Rate Regulation [Line Items]  
Regulatory Assets and Liabilities

The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations.

   LKE LG&E KU
   September 30, December 31, September 30, December 31, September 30, December 31,
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 ECR $ 7    $ 2    $ 5   
 Gas supply clause   13 $ 11   13 $ 11      
 Fuel adjustment clause      6      6      
 Other    9   2   4   2   5   
Total current regulatory assets $ 29 $ 19 $ 19 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 338 $ 368 $ 212 $ 232 $ 126 $ 136
 Storm costs   97   109   53   59   44   50
 Unamortized loss on debt    30   31   19   20   11   11
 Interest rate swaps   49   67   49   67      
 AROs   37   26   20   15   17   11
 Other    15   29   6   7   9   22
Total noncurrent regulatory assets $ 566 $ 630 $ 359 $ 400 $ 207 $ 230

Current Regulatory Liabilities:                  
  ECR    $ 4          $ 4
  Gas supply clause $ 2   4 $ 2 $ 4      
  Gas line tracker   6      6         
  Other    9   1   3    $ 6   1
Total current regulatory liabilities $ 17 $ 9 $ 11 $ 4 $ 6 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 690 $ 679 $ 300 $ 297 $ 390 $ 382
 Coal contracts (a)   108   141   47   61   61   80
 Power purchase agreement - OVEC (a)   102   108   71   75   31   33
 Net deferred tax assets   32   34   26   28   6   6
 Defined benefit plans   18   17         18   17
 Interest rate swaps   84   14   42   7   42   7
 Other    6   9   3   3   3   6
Total noncurrent regulatory liabilities $ 1,040 $ 1,002 $ 489 $ 471 $ 551 $ 531

(a)       These liabilities were recorded as offsets to certain intangible assets that were recorded at fair value upon the acquisition of LKE by PPL.