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Utility Rate Regulation (Tables)
 12 Months Ended
Dec. 31, 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
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 Environmental cost recovery $ 7 $ 1      
 Gas supply clause   10   11      
 Fuel adjustment clause   2   6      
 Demand side management   8   1      
 Other    6    $ 6   
Total current regulatory assets $ 33 $ 19 $ 6   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 509 $ 730 $ 257 $ 362
 Taxes recoverable through future rates   306   293   306   293
 Storm costs   147   168   53   59
 Unamortized loss on debt   85   96   57   65
 Interest rate swaps   44   67      
 Accumulated cost of removal of utility plant    98   71   98   71
 AROs   44   26      
 Other    13   32   1   3
Total noncurrent regulatory assets $ 1,246 $ 1,483 $ 772 $ 853

Current Regulatory Liabilities:            
 Generation supply charge $ 23 $ 27 $ 23 $ 27
 Environmental cost recovery      4      
 Gas supply clause   3   4      
 Transmission service charge   8   6   8   6
 Transmission formula rate   20      20   
 Fuel adjustment clause   4   1      
 Universal Service Rider   10   17   10   17
 Storm damage expense   14      14   
 Gas line tracker   6         
 Other    2   2   1   2
Total current regulatory liabilities $ 90 $ 61 $ 76 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 688 $ 679      
 Coal contracts (a)   98   141      
 Power purchase agreement - OVEC (a)   100   108      
 Net deferred tax assets   30   34      
 Act 129 compliance rider   15   8 $ 15 $ 8
 Defined benefit plans   26   17      
 Interest rate swaps   86   14      
 Other    5   9      
Total noncurrent regulatory liabilities $ 1,048 $ 1,010 $ 15 $ 8

   LKE LG&E KU
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 Environmental cost recovery $ 7 $ 1 $ 2 $ 1 $ 5   
 Gas supply clause   10   11   10   11      
 Fuel adjustment clause   2   6   2   6      
 Demand side management   8   1   3   1   5   
Total current regulatory assets $ 27 $ 19 $ 17 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 252 $ 368 $ 164 $ 232 $ 88 $ 136
 Storm costs   94   109   51   59   43   50
 Unamortized loss on debt    28   31   18   20   10   11
 Interest rate swaps   44   67   44   67      
 AROs   44   26   21   15   23   11
 Other    12   29   5   7   7   22
Total noncurrent regulatory assets $ 474 $ 630 $ 303 $ 400 $ 171 $ 230

Current Regulatory Liabilities:                  
  Environmental cost recovery    $ 4          $ 4
  Gas supply clause $ 3   4 $ 3 $ 4      
  Fuel adjustment clause   4   1       $ 4   1
  Gas line tracker   6      6         
  Other    1            1   
Total current regulatory liabilities $ 14 $ 9 $ 9 $ 4 $ 5 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 688 $ 679 $ 299 $ 297 $ 389 $ 382
 Coal contracts (a)   98   141   43   61   55   80
 Power purchase agreement - OVEC (a)   100   108   69   75   31   33
 Net deferred tax assets   30   34   26   28   4   6
 Defined benefit plans   26   17         26   17
 Interest rate swaps   86   14   43   7   43   7
 Other    5   9   2   3   3   6
Total noncurrent regulatory liabilities $ 1,033 $ 1,002 $ 482 $ 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.

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
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 Environmental cost recovery $ 7 $ 1      
 Gas supply clause   10   11      
 Fuel adjustment clause   2   6      
 Demand side management   8   1      
 Other    6    $ 6   
Total current regulatory assets $ 33 $ 19 $ 6   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 509 $ 730 $ 257 $ 362
 Taxes recoverable through future rates   306   293   306   293
 Storm costs   147   168   53   59
 Unamortized loss on debt   85   96   57   65
 Interest rate swaps   44   67      
 Accumulated cost of removal of utility plant    98   71   98   71
 AROs   44   26      
 Other    13   32   1   3
Total noncurrent regulatory assets $ 1,246 $ 1,483 $ 772 $ 853

Current Regulatory Liabilities:            
 Generation supply charge $ 23 $ 27 $ 23 $ 27
 Environmental cost recovery      4      
 Gas supply clause   3   4      
 Transmission service charge   8   6   8   6
 Transmission formula rate   20      20   
 Fuel adjustment clause   4   1      
 Universal Service Rider   10   17   10   17
 Storm damage expense   14      14   
 Gas line tracker   6         
 Other    2   2   1   2
Total current regulatory liabilities $ 90 $ 61 $ 76 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 688 $ 679      
 Coal contracts (a)   98   141      
 Power purchase agreement - OVEC (a)   100   108      
 Net deferred tax assets   30   34      
 Act 129 compliance rider   15   8 $ 15 $ 8
 Defined benefit plans   26   17      
 Interest rate swaps   86   14      
 Other    5   9      
Total noncurrent regulatory liabilities $ 1,048 $ 1,010 $ 15 $ 8

   LKE LG&E KU
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 Environmental cost recovery $ 7 $ 1 $ 2 $ 1 $ 5   
 Gas supply clause   10   11   10   11      
 Fuel adjustment clause   2   6   2   6      
 Demand side management   8   1   3   1   5   
Total current regulatory assets $ 27 $ 19 $ 17 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 252 $ 368 $ 164 $ 232 $ 88 $ 136
 Storm costs   94   109   51   59   43   50
 Unamortized loss on debt    28   31   18   20   10   11
 Interest rate swaps   44   67   44   67      
 AROs   44   26   21   15   23   11
 Other    12   29   5   7   7   22
Total noncurrent regulatory assets $ 474 $ 630 $ 303 $ 400 $ 171 $ 230

Current Regulatory Liabilities:                  
  Environmental cost recovery    $ 4          $ 4
  Gas supply clause $ 3   4 $ 3 $ 4      
  Fuel adjustment clause   4   1       $ 4   1
  Gas line tracker   6      6         
  Other    1            1   
Total current regulatory liabilities $ 14 $ 9 $ 9 $ 4 $ 5 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 688 $ 679 $ 299 $ 297 $ 389 $ 382
 Coal contracts (a)   98   141   43   61   55   80
 Power purchase agreement - OVEC (a)   100   108   69   75   31   33
 Net deferred tax assets   30   34   26   28   4   6
 Defined benefit plans   26   17         26   17
 Interest rate swaps   86   14   43   7   43   7
 Other    5   9   2   3   3   6
Total noncurrent regulatory liabilities $ 1,033 $ 1,002 $ 482 $ 471 $ 551 $ 531
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.

   PPL PPL Electric
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 Environmental cost recovery $ 7 $ 1      
 Gas supply clause   10   11      
 Fuel adjustment clause   2   6      
 Demand side management   8   1      
 Other    6    $ 6   
Total current regulatory assets $ 33 $ 19 $ 6   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 509 $ 730 $ 257 $ 362
 Taxes recoverable through future rates   306   293   306   293
 Storm costs   147   168   53   59
 Unamortized loss on debt   85   96   57   65
 Interest rate swaps   44   67      
 Accumulated cost of removal of utility plant    98   71   98   71
 AROs   44   26      
 Other    13   32   1   3
Total noncurrent regulatory assets $ 1,246 $ 1,483 $ 772 $ 853

Current Regulatory Liabilities:            
 Generation supply charge $ 23 $ 27 $ 23 $ 27
 Environmental cost recovery      4      
 Gas supply clause   3   4      
 Transmission service charge   8   6   8   6
 Transmission formula rate   20      20   
 Fuel adjustment clause   4   1      
 Universal Service Rider   10   17   10   17
 Storm damage expense   14      14   
 Gas line tracker   6         
 Other    2   2   1   2
Total current regulatory liabilities $ 90 $ 61 $ 76 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 688 $ 679      
 Coal contracts (a)   98   141      
 Power purchase agreement - OVEC (a)   100   108      
 Net deferred tax assets   30   34      
 Act 129 compliance rider   15   8 $ 15 $ 8
 Defined benefit plans   26   17      
 Interest rate swaps   86   14      
 Other    5   9      
Total noncurrent regulatory liabilities $ 1,048 $ 1,010 $ 15 $ 8

   LKE LG&E KU
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 Environmental cost recovery $ 7 $ 1 $ 2 $ 1 $ 5   
 Gas supply clause   10   11   10   11      
 Fuel adjustment clause   2   6   2   6      
 Demand side management   8   1   3   1   5   
Total current regulatory assets $ 27 $ 19 $ 17 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 252 $ 368 $ 164 $ 232 $ 88 $ 136
 Storm costs   94   109   51   59   43   50
 Unamortized loss on debt    28   31   18   20   10   11
 Interest rate swaps   44   67   44   67      
 AROs   44   26   21   15   23   11
 Other    12   29   5   7   7   22
Total noncurrent regulatory assets $ 474 $ 630 $ 303 $ 400 $ 171 $ 230

Current Regulatory Liabilities:                  
  Environmental cost recovery    $ 4          $ 4
  Gas supply clause $ 3   4 $ 3 $ 4      
  Fuel adjustment clause   4   1       $ 4   1
  Gas line tracker   6      6         
  Other    1            1   
Total current regulatory liabilities $ 14 $ 9 $ 9 $ 4 $ 5 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 688 $ 679 $ 299 $ 297 $ 389 $ 382
 Coal contracts (a)   98   141   43   61   55   80
 Power purchase agreement - OVEC (a)   100   108   69   75   31   33
 Net deferred tax assets   30   34   26   28   4   6
 Defined benefit plans   26   17         26   17
 Interest rate swaps   86   14   43   7   43   7
 Other    5   9   2   3   3   6
Total noncurrent regulatory liabilities $ 1,033 $ 1,002 $ 482 $ 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.

   PPL PPL Electric
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 Environmental cost recovery $ 7 $ 1      
 Gas supply clause   10   11      
 Fuel adjustment clause   2   6      
 Demand side management   8   1      
 Other    6    $ 6   
Total current regulatory assets $ 33 $ 19 $ 6   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 509 $ 730 $ 257 $ 362
 Taxes recoverable through future rates   306   293   306   293
 Storm costs   147   168   53   59
 Unamortized loss on debt   85   96   57   65
 Interest rate swaps   44   67      
 Accumulated cost of removal of utility plant    98   71   98   71
 AROs   44   26      
 Other    13   32   1   3
Total noncurrent regulatory assets $ 1,246 $ 1,483 $ 772 $ 853

Current Regulatory Liabilities:            
 Generation supply charge $ 23 $ 27 $ 23 $ 27
 Environmental cost recovery      4      
 Gas supply clause   3   4      
 Transmission service charge   8   6   8   6
 Transmission formula rate   20      20   
 Fuel adjustment clause   4   1      
 Universal Service Rider   10   17   10   17
 Storm damage expense   14      14   
 Gas line tracker   6         
 Other    2   2   1   2
Total current regulatory liabilities $ 90 $ 61 $ 76 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 688 $ 679      
 Coal contracts (a)   98   141      
 Power purchase agreement - OVEC (a)   100   108      
 Net deferred tax assets   30   34      
 Act 129 compliance rider   15   8 $ 15 $ 8
 Defined benefit plans   26   17      
 Interest rate swaps   86   14      
 Other    5   9      
Total noncurrent regulatory liabilities $ 1,048 $ 1,010 $ 15 $ 8

   LKE LG&E KU
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 Environmental cost recovery $ 7 $ 1 $ 2 $ 1 $ 5   
 Gas supply clause   10   11   10   11      
 Fuel adjustment clause   2   6   2   6      
 Demand side management   8   1   3   1   5   
Total current regulatory assets $ 27 $ 19 $ 17 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 252 $ 368 $ 164 $ 232 $ 88 $ 136
 Storm costs   94   109   51   59   43   50
 Unamortized loss on debt    28   31   18   20   10   11
 Interest rate swaps   44   67   44   67      
 AROs   44   26   21   15   23   11
 Other    12   29   5   7   7   22
Total noncurrent regulatory assets $ 474 $ 630 $ 303 $ 400 $ 171 $ 230

Current Regulatory Liabilities:                  
  Environmental cost recovery    $ 4          $ 4
  Gas supply clause $ 3   4 $ 3 $ 4      
  Fuel adjustment clause   4   1       $ 4   1
  Gas line tracker   6      6         
  Other    1            1   
Total current regulatory liabilities $ 14 $ 9 $ 9 $ 4 $ 5 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 688 $ 679 $ 299 $ 297 $ 389 $ 382
 Coal contracts (a)   98   141   43   61   55   80
 Power purchase agreement - OVEC (a)   100   108   69   75   31   33
 Net deferred tax assets   30   34   26   28   4   6
 Defined benefit plans   26   17         26   17
 Interest rate swaps   86   14   43   7   43   7
 Other    5   9   2   3   3   6
Total noncurrent regulatory liabilities $ 1,033 $ 1,002 $ 482 $ 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.

   PPL PPL Electric
   2013 2012 2013 2012
              
Current Regulatory Assets:            
 Environmental cost recovery $ 7 $ 1      
 Gas supply clause   10   11      
 Fuel adjustment clause   2   6      
 Demand side management   8   1      
 Other    6    $ 6   
Total current regulatory assets $ 33 $ 19 $ 6   
              
Noncurrent Regulatory Assets:            
 Defined benefit plans $ 509 $ 730 $ 257 $ 362
 Taxes recoverable through future rates   306   293   306   293
 Storm costs   147   168   53   59
 Unamortized loss on debt   85   96   57   65
 Interest rate swaps   44   67      
 Accumulated cost of removal of utility plant    98   71   98   71
 AROs   44   26      
 Other    13   32   1   3
Total noncurrent regulatory assets $ 1,246 $ 1,483 $ 772 $ 853

Current Regulatory Liabilities:            
 Generation supply charge $ 23 $ 27 $ 23 $ 27
 Environmental cost recovery      4      
 Gas supply clause   3   4      
 Transmission service charge   8   6   8   6
 Transmission formula rate   20      20   
 Fuel adjustment clause   4   1      
 Universal Service Rider   10   17   10   17
 Storm damage expense   14      14   
 Gas line tracker   6         
 Other    2   2   1   2
Total current regulatory liabilities $ 90 $ 61 $ 76 $ 52
              
Noncurrent Regulatory Liabilities:            
 Accumulated cost of removal of utility plant $ 688 $ 679      
 Coal contracts (a)   98   141      
 Power purchase agreement - OVEC (a)   100   108      
 Net deferred tax assets   30   34      
 Act 129 compliance rider   15   8 $ 15 $ 8
 Defined benefit plans   26   17      
 Interest rate swaps   86   14      
 Other    5   9      
Total noncurrent regulatory liabilities $ 1,048 $ 1,010 $ 15 $ 8

   LKE LG&E KU
   2013 2012 2013 2012 2013 2012
                    
Current Regulatory Assets:                  
 Environmental cost recovery $ 7 $ 1 $ 2 $ 1 $ 5   
 Gas supply clause   10   11   10   11      
 Fuel adjustment clause   2   6   2   6      
 Demand side management   8   1   3   1   5   
Total current regulatory assets $ 27 $ 19 $ 17 $ 19 $ 10   
                    
Noncurrent Regulatory Assets:                  
 Defined benefit plans $ 252 $ 368 $ 164 $ 232 $ 88 $ 136
 Storm costs   94   109   51   59   43   50
 Unamortized loss on debt    28   31   18   20   10   11
 Interest rate swaps   44   67   44   67      
 AROs   44   26   21   15   23   11
 Other    12   29   5   7   7   22
Total noncurrent regulatory assets $ 474 $ 630 $ 303 $ 400 $ 171 $ 230

Current Regulatory Liabilities:                  
  Environmental cost recovery    $ 4          $ 4
  Gas supply clause $ 3   4 $ 3 $ 4      
  Fuel adjustment clause   4   1       $ 4   1
  Gas line tracker   6      6         
  Other    1            1   
Total current regulatory liabilities $ 14 $ 9 $ 9 $ 4 $ 5 $ 5
                     
Noncurrent Regulatory Liabilities:                  
 Accumulated cost of removal                  
  of utility plant $ 688 $ 679 $ 299 $ 297 $ 389 $ 382
 Coal contracts (a)   98   141   43   61   55   80
 Power purchase agreement - OVEC (a)   100   108   69   75   31   33
 Net deferred tax assets   30   34   26   28   4   6
 Defined benefit plans   26   17         26   17
 Interest rate swaps   86   14   43   7   43   7
 Other    5   9   2   3   3   6
Total noncurrent regulatory liabilities $ 1,033 $ 1,002 $ 482 $ 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.