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Defined Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
Defined Benefits [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)

Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL, PPL Energy Supply, LKE and LG&E for the periods ended September 30:

    Pension Benefits
    Three Months Nine Months
    U.S. U.K. U.S. U.K.
    2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Service cost $ 25 $ 24 $ 13 $ 14 $ 77 $ 71 $ 40 $ 31
Interest cost   55   54   85   88   165   163   254   200
Expected return on plan assets   (65)   (61)   (115)   (103)   (195)   (184)   (340)   (243)
Amortization of:                        
  Prior service cost   6   6   1   1   18   18   3   3
  Actuarial (gain) loss    11   7   19   15   32   21   59   44
Net periodic defined benefit                         
 costs (credits) prior to                        
 termination benefits   32   30   3   15   97   89   16   35
Termination benefits (a)            45            47
Net periodic defined benefit                         
 costs (credits) $ 32 $ 30 $ 3 $ 60 $ 97 $ 89 $ 16 $ 82

(a)       In 2011, WPD Midlands recorded early retirement deficiency costs payable under applicable pension plans related to employees leaving the WPD Midlands companies. See Note 8 for additional information.

   Other Postretirement Benefits
   Three Months Nine Months
   2012 2011 2012 2011
              
PPL            
Service cost $ 3 $ 3 $ 9 $ 9
Interest cost   7   9   23   25
Expected return on plan assets   (6)   (6)   (17)   (17)
Amortization of:            
 Transition obligation         1   1
 Prior service cost   1      1   
 Actuarial (gain) loss   1   1   3   4
Net periodic defined benefit costs (credits) $ 6 $ 7 $ 20 $ 22

              
LKE            
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost   3   3   7   8
Expected return on plan assets   (1)   (1)   (3)   (3)
Amortization of:            
 Transition obligation         1   1
 Prior service cost      1   2   2
 Actuarial (gain) loss         (1)   
Net periodic defined benefit costs (credits) $ 3 $ 4 $ 9 $ 11
PPL Energy Supply LLC [Member]
  
Defined Benefits [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)

Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL, PPL Energy Supply, LKE and LG&E for the periods ended September 30:

    Pension Benefits
    Three Months Nine Months
    2012 2011 2012 2011
PPL Energy Supply            
Service cost $ 1 $ 1 $ 4 $ 3
Interest cost   2   1   6   5
Expected return on plan assets   (2)   (2)   (7)   (6)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 1 $ 5 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 16 $ 18
Interest cost   16   16   48   50
Expected return on plan assets   (17)   (16)   (52)   (48)
Amortization of:            
  Prior service cost   2   2   4   4
  Actuarial (gain) loss    5   6   16   17
Net periodic defined benefit costs (credits)  $ 11 $ 14 $ 32 $ 41
               
LG&E            
Service cost       $ 1 $ 1
Interest cost $ 4 $ 4   11   11
Expected return on plan assets   (5)   (4)   (14)   (13)
Amortization of:            
  Prior service cost   1      2   1
  Actuarial (gain) loss    3   3   8   9
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 8 $ 9
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic benefit costs to LG&E and KU, including amounts applied to accounts that are further distributed between capital and expense.

  Three Months Nine Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 10 $ 8 $ 29 $ 23
PPL Electric   8   6   23   18

LG&E   3   5   9   13
KU   4   6   13   17
PPL Electric Utilities Corp [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic benefit costs to LG&E and KU, including amounts applied to accounts that are further distributed between capital and expense.

  Three Months Nine Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 10 $ 8 $ 29 $ 23
PPL Electric   8   6   23   18

LG&E   3   5   9   13
KU   4   6   13   17
LG And E And KU Energy LLC [Member]
  
Defined Benefits [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)

Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL, PPL Energy Supply, LKE and LG&E for the periods ended September 30:

    Pension Benefits
    Three Months Nine Months
    2012 2011 2012 2011
PPL Energy Supply            
Service cost $ 1 $ 1 $ 4 $ 3
Interest cost   2   1   6   5
Expected return on plan assets   (2)   (2)   (7)   (6)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 1 $ 5 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 16 $ 18
Interest cost   16   16   48   50
Expected return on plan assets   (17)   (16)   (52)   (48)
Amortization of:            
  Prior service cost   2   2   4   4
  Actuarial (gain) loss    5   6   16   17
Net periodic defined benefit costs (credits)  $ 11 $ 14 $ 32 $ 41
               
LG&E            
Service cost       $ 1 $ 1
Interest cost $ 4 $ 4   11   11
Expected return on plan assets   (5)   (4)   (14)   (13)
Amortization of:            
  Prior service cost   1      2   1
  Actuarial (gain) loss    3   3   8   9
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 8 $ 9

   Other Postretirement Benefits
   Three Months Nine Months
   2012 2011 2012 2011
              
PPL            
Service cost $ 3 $ 3 $ 9 $ 9
Interest cost   7   9   23   25
Expected return on plan assets   (6)   (6)   (17)   (17)
Amortization of:            
 Transition obligation         1   1
 Prior service cost   1      1   
 Actuarial (gain) loss   1   1   3   4
Net periodic defined benefit costs (credits) $ 6 $ 7 $ 20 $ 22

              
LKE            
Service cost $ 1 $ 1 $ 3 $ 3
Interest cost   3   3   7   8
Expected return on plan assets   (1)   (1)   (3)   (3)
Amortization of:            
 Transition obligation         1   1
 Prior service cost      1   2   2
 Actuarial (gain) loss         (1)   
Net periodic defined benefit costs (credits) $ 3 $ 4 $ 9 $ 11
Louisville Gas And Electric Co [Member]
  
Defined Benefits [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)

Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL, PPL Energy Supply, LKE and LG&E for the periods ended September 30:

    Pension Benefits
    Three Months Nine Months
    2012 2011 2012 2011
PPL Energy Supply            
Service cost $ 1 $ 1 $ 4 $ 3
Interest cost   2   1   6   5
Expected return on plan assets   (2)   (2)   (7)   (6)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 1 $ 5 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 16 $ 18
Interest cost   16   16   48   50
Expected return on plan assets   (17)   (16)   (52)   (48)
Amortization of:            
  Prior service cost   2   2   4   4
  Actuarial (gain) loss    5   6   16   17
Net periodic defined benefit costs (credits)  $ 11 $ 14 $ 32 $ 41
               
LG&E            
Service cost       $ 1 $ 1
Interest cost $ 4 $ 4   11   11
Expected return on plan assets   (5)   (4)   (14)   (13)
Amortization of:            
  Prior service cost   1      2   1
  Actuarial (gain) loss    3   3   8   9
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 8 $ 9
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic benefit costs to LG&E and KU, including amounts applied to accounts that are further distributed between capital and expense.

  Three Months Nine Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 10 $ 8 $ 29 $ 23
PPL Electric   8   6   23   18

LG&E   3   5   9   13
KU   4   6   13   17
Kentucky Utilities Co [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic benefit costs to LG&E and KU, including amounts applied to accounts that are further distributed between capital and expense.

  Three Months Nine Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 10 $ 8 $ 29 $ 23
PPL Electric   8   6   23   18

LG&E   3   5   9   13
KU   4   6   13   17