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Defined Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
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.
    2013 2012 2013 2012 2013 2012 2013 2012
PPL                        
Service cost $ 31 $ 25 $ 18 $ 13 $ 94 $ 77 $ 52 $ 40
Interest cost   53   55   79   85   160   165   238   254
Expected return on plan assets   (73)   (65)   (115)   (115)   (220)   (195)   (346)   (340)
Amortization of:                        
  Prior service cost   6   6      1   17   18      3
  Actuarial (gain) loss    20   11   37   19   60   32   112   59
Net periodic defined benefit                         
 costs (credits) $ 37 $ 32 $ 19 $ 3 $ 111 $ 97 $ 56 $ 16

   Other Postretirement Benefits
   Three Months Nine Months
   2013 2012 2013 2012
PPL            
Service cost $ 4 $ 3 $ 11 $ 9
Interest cost   7   7   21   23
Expected return on plan assets   (6)   (6)   (18)   (17)
Amortization of:            
 Transition obligation            1
 Prior service cost      1      1
 Actuarial (gain) loss   1   1   4   3
Net periodic defined benefit costs (credits) $ 6 $ 6 $ 18 $ 20

              
LKE            
Service cost $ 2 $ 1 $ 4 $ 3
Interest cost   2   3   6   7
Expected return on plan assets   (2)   (1)   (4)   (3)
Amortization of:            
 Transition obligation            1
 Prior service cost   1      2   2
 Actuarial (gain) loss            (1)
Net periodic defined benefit costs (credits) $ 3 $ 3 $ 8 $ 9
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
    2013 2012 2013 2012
PPL Energy Supply            
Service cost $ 1 $ 1 $ 5 $ 4
Interest cost   2   2   6   6
Expected return on plan assets   (2)   (2)   (7)   (7)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 6 $ 5

               
LKE            
Service cost $ 6 $ 5 $ 19 $ 16
Interest cost   16   16   47   48
Expected return on plan assets   (20)   (17)   (61)   (52)
Amortization of:            
  Prior service cost   1   2   3   4
  Actuarial (gain) loss    8   5   25   16
Net periodic defined benefit costs (credits)  $ 11 $ 11 $ 33 $ 32
               
LG&E            
Service cost $ 1    $ 2 $ 1
Interest cost   3 $ 4   10   11
Expected return on plan assets   (5)   (5)   (15)   (14)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   3   10   8
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 9 $ 8
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic defined benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU.

  Three Months Nine Months
  2013 2012 2013 2012
             
PPL Energy Supply $ 11 $ 10 $ 34 $ 29
PPL Electric   9   8   27   23

LG&E   3   3   9   9
KU   4   4   13   13
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 defined benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU.

  Three Months Nine Months
  2013 2012 2013 2012
             
PPL Energy Supply $ 11 $ 10 $ 34 $ 29
PPL Electric   9   8   27   23

LG&E   3   3   9   9
KU   4   4   13   13
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
    2013 2012 2013 2012
PPL Energy Supply            
Service cost $ 1 $ 1 $ 5 $ 4
Interest cost   2   2   6   6
Expected return on plan assets   (2)   (2)   (7)   (7)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 6 $ 5

               
LKE            
Service cost $ 6 $ 5 $ 19 $ 16
Interest cost   16   16   47   48
Expected return on plan assets   (20)   (17)   (61)   (52)
Amortization of:            
  Prior service cost   1   2   3   4
  Actuarial (gain) loss    8   5   25   16
Net periodic defined benefit costs (credits)  $ 11 $ 11 $ 33 $ 32
               
LG&E            
Service cost $ 1    $ 2 $ 1
Interest cost   3 $ 4   10   11
Expected return on plan assets   (5)   (5)   (15)   (14)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   3   10   8
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 9 $ 8

   Other Postretirement Benefits
   Three Months Nine Months
   2013 2012 2013 2012
PPL            
Service cost $ 4 $ 3 $ 11 $ 9
Interest cost   7   7   21   23
Expected return on plan assets   (6)   (6)   (18)   (17)
Amortization of:            
 Transition obligation            1
 Prior service cost      1      1
 Actuarial (gain) loss   1   1   4   3
Net periodic defined benefit costs (credits) $ 6 $ 6 $ 18 $ 20

              
LKE            
Service cost $ 2 $ 1 $ 4 $ 3
Interest cost   2   3   6   7
Expected return on plan assets   (2)   (1)   (4)   (3)
Amortization of:            
 Transition obligation            1
 Prior service cost   1      2   2
 Actuarial (gain) loss            (1)
Net periodic defined benefit costs (credits) $ 3 $ 3 $ 8 $ 9
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
    2013 2012 2013 2012
PPL Energy Supply            
Service cost $ 1 $ 1 $ 5 $ 4
Interest cost   2   2   6   6
Expected return on plan assets   (2)   (2)   (7)   (7)
Amortization of:            
  Actuarial (gain) loss   1   1   2   2
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 6 $ 5

               
LKE            
Service cost $ 6 $ 5 $ 19 $ 16
Interest cost   16   16   47   48
Expected return on plan assets   (20)   (17)   (61)   (52)
Amortization of:            
  Prior service cost   1   2   3   4
  Actuarial (gain) loss    8   5   25   16
Net periodic defined benefit costs (credits)  $ 11 $ 11 $ 33 $ 32
               
LG&E            
Service cost $ 1    $ 2 $ 1
Interest cost   3 $ 4   10   11
Expected return on plan assets   (5)   (5)   (15)   (14)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   3   10   8
Net periodic defined benefit costs (credits)  $ 3 $ 3 $ 9 $ 8
Allocation of Net Periodic Benefit Costs

For the periods ended September 30, PPL Services allocated the following net periodic defined benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU.

  Three Months Nine Months
  2013 2012 2013 2012
             
PPL Energy Supply $ 11 $ 10 $ 34 $ 29
PPL Electric   9   8   27   23

LG&E   3   3   9   9
KU   4   4   13   13
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 defined benefit costs to PPL Energy Supply subsidiaries and PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU.

  Three Months Nine Months
  2013 2012 2013 2012
             
PPL Energy Supply $ 11 $ 10 $ 34 $ 29
PPL Electric   9   8   27   23

LG&E   3   3   9   9
KU   4   4   13   13