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Defined Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
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 March 31. The U.K. pension benefits apply to PPL only.

    Pension Benefits Other Postretirement Benefits
    U.S. U.K.      
                     
    Three Months
    2014 2013 2014 2013 2014 2013
PPL                  
Service cost $ 26 $ 31 $ 18 $ 18 $ 3 $ 4
Interest cost   59   54   88   81   8   7
Expected return on plan assets   (74)   (74)   (130)   (118)   (6)   (6)
Amortization of:                  
  Prior service cost   5   6            
  Actuarial (gain) loss    7   20   33   38      1
Net periodic defined benefit costs (credits) $23 $37 $9 $19 $5 $6

PPL Energy Supply                  
Service cost $ 1 $ 2            
Interest cost   2   2            
Expected return on plan assets   (2)   (3)            
Amortization of:                  
  Actuarial (gain) loss      1            
Net periodic defined benefit costs (credits) $ 1 $ 2            
                     

LKE                  
Service cost $ 6 $ 7       $ 1 $ 1
Interest cost   17   16         2   2
Expected return on plan assets   (20)   (21)         (1)   (1)
Amortization of:                  
  Prior service cost   1   1         1   1
  Actuarial (gain) loss    3   8            
Net periodic defined benefit costs (credits)  $ 7 $ 11       $ 3 $ 3
                     
LG&E                  
Service cost    $ 1            
Interest cost $ 4   3            
Expected return on plan assets   (5)   (5)            
Amortization of:                  
  Prior service cost   1   1            
  Actuarial (gain) loss    1   3            
Net periodic defined benefit costs (credits)  $ 1 $ 3            
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 March 31. The U.K. pension benefits apply to PPL only.

    Pension Benefits Other Postretirement Benefits
    U.S. U.K.      
                     
    Three Months
    2014 2013 2014 2013 2014 2013
PPL                  
Service cost $ 26 $ 31 $ 18 $ 18 $ 3 $ 4
Interest cost   59   54   88   81   8   7
Expected return on plan assets   (74)   (74)   (130)   (118)   (6)   (6)
Amortization of:                  
  Prior service cost   5   6            
  Actuarial (gain) loss    7   20   33   38      1
Net periodic defined benefit costs (credits) $23 $37 $9 $19 $5 $6

PPL Energy Supply                  
Service cost $ 1 $ 2            
Interest cost   2   2            
Expected return on plan assets   (2)   (3)            
Amortization of:                  
  Actuarial (gain) loss      1            
Net periodic defined benefit costs (credits) $ 1 $ 2            
                     

LKE                  
Service cost $ 6 $ 7       $ 1 $ 1
Interest cost   17   16         2   2
Expected return on plan assets   (20)   (21)         (1)   (1)
Amortization of:                  
  Prior service cost   1   1         1   1
  Actuarial (gain) loss    3   8            
Net periodic defined benefit costs (credits)  $ 7 $ 11       $ 3 $ 3
                     
LG&E                  
Service cost    $ 1            
Interest cost $ 4   3            
Expected return on plan assets   (5)   (5)            
Amortization of:                  
  Prior service cost   1   1            
  Actuarial (gain) loss    1   3            
Net periodic defined benefit costs (credits)  $ 1 $ 3            
Allocation of Net Periodic Benefit Costs

For the periods ended March 31, 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
      2014 2013
             
PPL Energy Supply       $ 7 $ 11
PPL Electric         5   9

LG&E         2   3
KU         3   4
PPL Electric Utilities Corp [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended March 31, 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
      2014 2013
             
PPL Energy Supply       $ 7 $ 11
PPL Electric         5   9

LG&E         2   3
KU         3   4
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 March 31. The U.K. pension benefits apply to PPL only.

    Pension Benefits Other Postretirement Benefits
    U.S. U.K.      
                     
    Three Months
    2014 2013 2014 2013 2014 2013
PPL                  
Service cost $ 26 $ 31 $ 18 $ 18 $ 3 $ 4
Interest cost   59   54   88   81   8   7
Expected return on plan assets   (74)   (74)   (130)   (118)   (6)   (6)
Amortization of:                  
  Prior service cost   5   6            
  Actuarial (gain) loss    7   20   33   38      1
Net periodic defined benefit costs (credits) $23 $37 $9 $19 $5 $6

PPL Energy Supply                  
Service cost $ 1 $ 2            
Interest cost   2   2            
Expected return on plan assets   (2)   (3)            
Amortization of:                  
  Actuarial (gain) loss      1            
Net periodic defined benefit costs (credits) $ 1 $ 2            
                     

LKE                  
Service cost $ 6 $ 7       $ 1 $ 1
Interest cost   17   16         2   2
Expected return on plan assets   (20)   (21)         (1)   (1)
Amortization of:                  
  Prior service cost   1   1         1   1
  Actuarial (gain) loss    3   8            
Net periodic defined benefit costs (credits)  $ 7 $ 11       $ 3 $ 3
                     
LG&E                  
Service cost    $ 1            
Interest cost $ 4   3            
Expected return on plan assets   (5)   (5)            
Amortization of:                  
  Prior service cost   1   1            
  Actuarial (gain) loss    1   3            
Net periodic defined benefit costs (credits)  $ 1 $ 3            
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 March 31. The U.K. pension benefits apply to PPL only.

    Pension Benefits Other Postretirement Benefits
    U.S. U.K.      
                     
    Three Months
    2014 2013 2014 2013 2014 2013
PPL                  
Service cost $ 26 $ 31 $ 18 $ 18 $ 3 $ 4
Interest cost   59   54   88   81   8   7
Expected return on plan assets   (74)   (74)   (130)   (118)   (6)   (6)
Amortization of:                  
  Prior service cost   5   6            
  Actuarial (gain) loss    7   20   33   38      1
Net periodic defined benefit costs (credits) $23 $37 $9 $19 $5 $6

PPL Energy Supply                  
Service cost $ 1 $ 2            
Interest cost   2   2            
Expected return on plan assets   (2)   (3)            
Amortization of:                  
  Actuarial (gain) loss      1            
Net periodic defined benefit costs (credits) $ 1 $ 2            
                     

LKE                  
Service cost $ 6 $ 7       $ 1 $ 1
Interest cost   17   16         2   2
Expected return on plan assets   (20)   (21)         (1)   (1)
Amortization of:                  
  Prior service cost   1   1         1   1
  Actuarial (gain) loss    3   8            
Net periodic defined benefit costs (credits)  $ 7 $ 11       $ 3 $ 3
                     
LG&E                  
Service cost    $ 1            
Interest cost $ 4   3            
Expected return on plan assets   (5)   (5)            
Amortization of:                  
  Prior service cost   1   1            
  Actuarial (gain) loss    1   3            
Net periodic defined benefit costs (credits)  $ 1 $ 3            
Allocation of Net Periodic Benefit Costs

For the periods ended March 31, 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
      2014 2013
             
PPL Energy Supply       $ 7 $ 11
PPL Electric         5   9

LG&E         2   3
KU         3   4
Kentucky Utilities Co [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended March 31, 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
      2014 2013
             
PPL Energy Supply       $ 7 $ 11
PPL Electric         5   9

LG&E         2   3
KU         3   4