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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]  
Schedule of Comprehensive Income (Loss)

AOCI, which is presented on the Balance Sheets of PPL and included in Member's equity on the Balance Sheets of PPL Energy Supply and LKE, consisted of the following after-tax gains (losses).

     Unrealized gains (losses)    Defined benefit plans   
  Foreign                  
  currency Available-    Equity Prior Actuarial Transition   
  translation for-sale Qualifying investees' service gain asset   
  adjustments securities derivatives AOCI costs (loss) (obligation) Total
PPL                        
                         
December 31, 2009$ (136) $ 62 $ 602 $ (2) $ (61) $ (993) $ (9) $ (537)
OCI  (59)   24   93      29   (39)   10   58
December 31, 2010$ (195) $ 86 $ 695 $ (2) $ (32) $ (1,032) $ 1 $ (479)
                         
OCI  (48)   2   (168)   3   7   (105)      (309)
December 31, 2011$ (243) $ 88 $ 527 $ 1 $ (25) $ (1,137) $ 1 $ (788)
                         
OCI  94   22   (395)   2   11   (886)      (1,152)
December 31, 2012$ (149) $ 110 $ 132 $ 3 $ (14) $ (2,023) $ 1 $ (1,940)
                         
PPL Energy Supply                       
                         
December 31, 2009$ (136) $ 62 $ 573 $ (2) $ (44) $ (930) $ (7) $ (484)
OCI  (59)   24   159      21   (23)   7   129
December 31, 2010$ (195) $ 86 $ 732 $ (2) $ (23) $ (953) $  $ (355)
                         
OCI     2   (86)   3   2   (18)      (97)
Distribution of membership                       
 interest in PPL Global (a)  195      (41)      5   780      939
December 31, 2011$  $ 88 $ 605 $ 1 $ (16) $ (191)    $ 487
                         
OCI     22   (395)      6   (72)      (439)
December 31, 2012   $ 110 $ 210 $ 1 $ (10) $ (263)    $ 48
Schedule of Utility Revenue

For the years ended December 31, the Statements of Income "Utility" line item contains rate-regulated revenue from the following:

    2012  2011  2010
Domestic electric and gas revenue (a) $ 4,519 $ 4,674 $ 2,941
U.K. electric revenue (b)   2,289   1,618   727
 Total $ 6,808 $ 6,292 $ 3,668

(a)       Represents revenue from regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, including regulated wholesale revenue. 2010 includes two months of revenue for LKE.

(b)       Represents electric distribution revenue from the operation of WPD's distribution networks. 2011 includes eight months of revenue for WPD Midlands.

Schedule of Valuation and Qualifying Accounts Disclosure

The changes in the allowance for doubtful accounts were:

      Additions         
  Balance at   Charged to      Balance at
  Beginning of Period Charged to Income Other Accounts  Deductions (a) End of Period
PPL                     
2012 $ 54  $ 55(c)     $ 45  $ 64 
2011   55    65(c)       66(d)   54 
2010   37    42(b) $ 7(b) (e)   31    55(b)
                     
PPL Energy Supply                     
2012 $ 15  $ 12(c)     $ 4  $ 23 
2011   20    14(c)       19(d)   15 
2010   21    1        2    20 
                     
PPL Electric                    
2012 $ 17  $ 32      $ 31  $ 18 
2011   17    33        33    17 
2010   16    30        29    17 

                     
LKE                    
2012 - Successor $ 17  $ 9      $ 7  $ 19 
2011 - Successor    17    15        15    17 
2010 - Successor       10  $ 7(e)        17 
2010 - Predecessor   4    10        10    4 
                     
LG&E                    
2012 - Successor $ 2  $ 2      $ 3  $ 1 
2011 - Successor    2    5        5    2 
2010 - Successor       1  $ 2(e)    1    2 
2010 - Predecessor   2    4        4    2 
                     
KU                    
2012 - Successor $ 2  $ 4      $ 4  $ 2 
2011 - Successor    6    6        10    2 
2010 - Successor       1  $ 6(e)    1    6 
2010 - Predecessor   3    6        6    3 

(a)       Primarily related to uncollectible accounts written off.

(b)       Includes amounts associated with LKE activity since the November 1, 2010 acquisition date. See Note 10 for additional information related to the acquisition of LKE.

(c)       Includes amounts related to the SMGT bankruptcy. See Note 15 for additional information.

(d)       Includes amounts related to the June 2011, FERC approved settlement agreement between PPL and the California ISO related to the sales made to the California ISO during the period October 2000 through June 2001 that were not paid to PPL subsidiaries. Therefore, the receivable and the related allowance for doubtful accounts were reversed and the settlement recorded.

(e)       Primarily related to capital projects, thus the provision was recorded as an adjustment to construction work in progress.

Schedule of Restricted Cash and Cash Equivalents

At December 31, the balances of restricted cash and cash equivalents included the following.

     PPL PPL Energy Supply PPL Electric LKE LG&E
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Margin deposits posted to                              
 counterparties  $ 43 $ 137 $ 43 $ 137                  
Cash collateral posted to                              
 counterparties    32   29             $ 32 $ 29 $ 32 $ 29
Low carbon network fund (a)   14   9                        
Captive insurance reserves (b)   6   6                        
Funds deposited with a trustee (c)   13   12       $ 13 $ 12            
Ironwood debt service reserves    17      17                     
Other   10   16   3   8      1            
  Total $ 135 $ 209 $ 63 $ 145 $ 13 $ 13 $ 32 $ 29 $ 32 $ 29

(a)       Funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

(b)       Funds required by law to be held by WPD's captive insurance company to meet claims.

(c)       Funds deposited with a trustee to defease PPL Electric's 1945 First Mortgage Bonds.

Capitalized Interest Costs

Capitalized interest, excluding AFUDC for PPL, is as follows.

     PPL
  PPL Energy Supply
       
2012 $ 53 $ 47
2011   51   47
2010   30   33
Weighted-average Rates of Depreciation

Following are the weighted-average rates of depreciation at December 31.

  2012
     PPL            
     Energy PPL        
  PPL Supply Electric LKE LG&E KU
                    
Regulated utility plant   3.12      2.57    4.39   4.91   4.06
Non-regulated PP&E - Generation   3.05   3.05             
                    
  2011
     PPL            
     Energy PPL        
  PPL Supply Electric LKE LG&E KU
                    
Regulated utility plant   3.03      2.49    4.54   5.11   4.17
Non-regulated PP&E - Generation   2.88   2.88             
Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31.

     PPL PPL Energy Supply LKE LG&E KU
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Fuel  $ 284 $ 246 $ 135 $ 96 $ 149 $ 150 $ 61 $ 53 $ 88 $ 97
Natural gas stored underground (a)   50   73   8   20   42   53   42   53      
Materials and supplies   339   335   184   182   85   80   39   36   46   44
    $ 673 $ 654 $ 327 $ 298 $ 276 $ 283 $ 142 $ 142 $ 134 $ 141

(a)       The majority of LKE's and LG&E's natural gas stored underground is held to serve native load. The majority of PPL Energy Supply's natural gas stored underground is available for resale.

PPL Energy Supply LLC [Member]
  
Summary Of Significant Accounting Policies [Line Items]  
Schedule of Comprehensive Income (Loss)

AOCI, which is presented on the Balance Sheets of PPL and included in Member's equity on the Balance Sheets of PPL Energy Supply and LKE, consisted of the following after-tax gains (losses).

     Unrealized gains (losses)    Defined benefit plans   
  Foreign                  
  currency Available-    Equity Prior Actuarial Transition   
  translation for-sale Qualifying investees' service gain asset   
  adjustments securities derivatives AOCI costs (loss) (obligation) Total
PPL                        
                         
December 31, 2009$ (136) $ 62 $ 602 $ (2) $ (61) $ (993) $ (9) $ (537)
OCI  (59)   24   93      29   (39)   10   58
December 31, 2010$ (195) $ 86 $ 695 $ (2) $ (32) $ (1,032) $ 1 $ (479)
                         
OCI  (48)   2   (168)   3   7   (105)      (309)
December 31, 2011$ (243) $ 88 $ 527 $ 1 $ (25) $ (1,137) $ 1 $ (788)
                         
OCI  94   22   (395)   2   11   (886)      (1,152)
December 31, 2012$ (149) $ 110 $ 132 $ 3 $ (14) $ (2,023) $ 1 $ (1,940)
                         
PPL Energy Supply                       
                         
December 31, 2009$ (136) $ 62 $ 573 $ (2) $ (44) $ (930) $ (7) $ (484)
OCI  (59)   24   159      21   (23)   7   129
December 31, 2010$ (195) $ 86 $ 732 $ (2) $ (23) $ (953) $  $ (355)
                         
OCI     2   (86)   3   2   (18)      (97)
Distribution of membership                       
 interest in PPL Global (a)  195      (41)      5   780      939
December 31, 2011$  $ 88 $ 605 $ 1 $ (16) $ (191)    $ 487
                         
OCI     22   (395)      6   (72)      (439)
December 31, 2012   $ 110 $ 210 $ 1 $ (10) $ (263)    $ 48

(a)       See Note 9 for additional information.

Capitalized Interest Costs

Capitalized interest, excluding AFUDC for PPL, is as follows.

     PPL
  PPL Energy Supply
       
2012 $ 53 $ 47
2011   51   47
2010   30   33
Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded.

  2012 2011
       
PPL Energy Supply $ (38) $ (50)
PPL Electric   22   22
LKE   (12)   3
LG&E   5   4
KU   (15)   5
Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31.

     PPL PPL Energy Supply LKE LG&E KU
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Fuel  $ 284 $ 246 $ 135 $ 96 $ 149 $ 150 $ 61 $ 53 $ 88 $ 97
Natural gas stored underground (a)   50   73   8   20   42   53   42   53      
Materials and supplies   339   335   184   182   85   80   39   36   46   44
    $ 673 $ 654 $ 327 $ 298 $ 276 $ 283 $ 142 $ 142 $ 134 $ 141

(a)       The majority of LKE's and LG&E's natural gas stored underground is held to serve native load. The majority of PPL Energy Supply's natural gas stored underground is available for resale.

PPL Electric Utilities Corp [Member]
  
Summary Of Significant Accounting Policies [Line Items]  
Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded.

  2012 2011
       
PPL Energy Supply $ (38) $ (50)
PPL Electric   22   22
LKE   (12)   3
LG&E   5   4
KU   (15)   5
LG And E And KU Energy LLC [Member]
  
Summary Of Significant Accounting Policies [Line Items]  
Schedule of Comprehensive Income (Loss)

AOCI, which is presented on the Balance Sheets of PPL and included in Member's equity on the Balance Sheets of PPL Energy Supply and LKE, consisted of the following after-tax gains (losses).

          Defined benefit plans   
  Foreign Unrealized          
  currency gains (losses) Equity Prior      
  translation on qualifying investees' service Actuarial   
  adjustments derivatives AOCI costs gain (loss) Total
                   
LKE                 
                   
December 31, 2009 - Predecessor$ 11 $ (6)    $ (12) $ (36) $ (43)
Disposal of discontinued operations  (11)               (11)
OCI     10 $ (2)   1   (19)   (10)
October 31, 2010 - Predecessor$  $ 4 $ (2) $ (11) $ (55) $ (64)
                   
Effect of PPL acquisition     (4)   2   11   55   64
OCI              6   6
December 31, 2010 - Successor   $  $  $  $ 6 $ 6
                   
OCI           (2)      (2)
December 31, 2011 - Successor         $ (2) $ 6 $ 4
                   
OCI        1      (20)   (19)
December 31, 2012 - Successor      $ 1 $ (2) $ (14) $ (15)
Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded.

  2012 2011
       
PPL Energy Supply $ (38) $ (50)
PPL Electric   22   22
LKE   (12)   3
LG&E   5   4
KU   (15)   5
Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31.

     PPL PPL Energy Supply LKE LG&E KU
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Fuel  $ 284 $ 246 $ 135 $ 96 $ 149 $ 150 $ 61 $ 53 $ 88 $ 97
Natural gas stored underground (a)   50   73   8   20   42   53   42   53      
Materials and supplies   339   335   184   182   85   80   39   36   46   44
    $ 673 $ 654 $ 327 $ 298 $ 276 $ 283 $ 142 $ 142 $ 134 $ 141

(a)       The majority of LKE's and LG&E's natural gas stored underground is held to serve native load. The majority of PPL Energy Supply's natural gas stored underground is available for resale.

Louisville Gas And Electric Co [Member]
  
Summary Of Significant Accounting Policies [Line Items]  
Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded.

  2012 2011
       
PPL Energy Supply $ (38) $ (50)
PPL Electric   22   22
LKE   (12)   3
LG&E   5   4
KU   (15)   5
Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31.

     PPL PPL Energy Supply LKE LG&E KU
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Fuel  $ 284 $ 246 $ 135 $ 96 $ 149 $ 150 $ 61 $ 53 $ 88 $ 97
Natural gas stored underground (a)   50   73   8   20   42   53   42   53      
Materials and supplies   339   335   184   182   85   80   39   36   46   44
    $ 673 $ 654 $ 327 $ 298 $ 276 $ 283 $ 142 $ 142 $ 134 $ 141

(a)       The majority of LKE's and LG&E's natural gas stored underground is held to serve native load. The majority of PPL Energy Supply's natural gas stored underground is available for resale.

Kentucky Utilities Co [Member]
  
Summary Of Significant Accounting Policies [Line Items]  
Intercompany tax receivables (payables)

At December 31, the following intercompany tax receivables (payables) were recorded.

  2012 2011
       
PPL Energy Supply $ (38) $ (50)
PPL Electric   22   22
LKE   (12)   3
LG&E   5   4
KU   (15)   5
Schedule of Utility Inventory

"Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31.

     PPL PPL Energy Supply LKE LG&E KU
     2012 2011 2012 2011 2012 2011 2012 2011 2012 2011
                                  
Fuel  $ 284 $ 246 $ 135 $ 96 $ 149 $ 150 $ 61 $ 53 $ 88 $ 97
Natural gas stored underground (a)   50   73   8   20   42   53   42   53      
Materials and supplies   339   335   184   182   85   80   39   36   46   44
    $ 673 $ 654 $ 327 $ 298 $ 276 $ 283 $ 142 $ 142 $ 134 $ 141

(a)       The majority of LKE's and LG&E's natural gas stored underground is held to serve native load. The majority of PPL Energy Supply's natural gas stored underground is available for resale.