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Defined Benefits (Tables)
 6 Months Ended
Jun. 30, 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 June 30:

    Pension Benefits
    Three Months Six Months
    U.S. U.K. U.S. U.K.
    2014 2013 2014 2013 2014 2013 2014 2013
PPL                        
Service cost $ 25 $ 32 $ 18 $ 16 $ 51 $ 63 $ 36 $ 34
Interest cost   58   53   90   78   117   107   178   159
Expected return on plan assets   (75)   (73)   (132)   (113)   (149)   (147)   (262)   (231)
Amortization of:                        
  Prior service cost   5   5         10   11      
  Actuarial (gain) loss    8   20   33   37   15   40   66   75
Net periodic defined benefit                        
 costs (credits) prior to                        
 termination benefits   21   37   9   18   44   74   18   37
Termination benefits (a)   20            20         
Net periodic defined benefit                         
 costs (credits) $ 41 $ 37 $ 9 $ 18 $ 64 $ 74 $ 18 $ 37

(a)       See Note 10 for details of a one-time voluntary retirement window offered to certain bargaining unit employees.

   Other Postretirement Benefits
   Three Months Six Months
   2014 2013 2014 2013
PPL            
Service cost $ 3 $ 3 $ 6 $ 7
Interest cost   8   7   16   14
Expected return on plan assets   (7)   (6)   (13)   (12)
Amortization of:            
 Actuarial (gain) loss      2      3
Net periodic defined benefit costs (credits) $ 4 $ 6 $ 9 $ 12

              
LKE            
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost   3   2   5   4
Expected return on plan assets   (2)   (1)   (3)   (2)
Amortization of:            
 Prior service cost         1   1
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 5 $ 5
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 June 30:

    Pension Benefits
    Three Months Six Months
    2014 2013 2014 2013
PPL Energy Supply            
Service cost $ 2 $ 2 $ 3 $ 4
Interest cost   2   2   4   4
Expected return on plan assets   (3)   (2)   (5)   (5)
Amortization of:            
  Actuarial (gain) loss   1      1   1
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 3 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 11 $ 13
Interest cost   16   15   33   31
Expected return on plan assets   (21)   (20)   (41)   (41)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   9   6   17
Net periodic defined benefit costs (credits)  $ 4 $ 11 $ 11 $ 22
               
LG&E            
Service cost $ 1    $ 1 $ 1
Interest cost   3 $ 4   7   7
Expected return on plan assets   (5)   (5)   (10)   (10)
Amortization of:            
  Prior service cost         1   1
  Actuarial (gain) loss    2   4   3   7
Net periodic defined benefit costs (credits)  $ 1 $ 3 $ 2 $ 6

(a)       See Note 10 for details of a one-time voluntary retirement window offered to certain bargaining unit employees.

Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2014 2013 2014 2013
             
PPL Energy Supply (a) $ 23 $ 12 $ 30 $ 23
PPL Electric (a)    10   9   15   18

LG&E   2   3   4   6
KU   1   5   4   9

(a)       The three and six months ended June 30, 2014 include $16 million and $4 million of termination benefits for PPL Energy Supply and PPL Electric related to a one-time voluntary retirement window offered to certain bargaining unit employees. See Note 10 for additional information.

PPL Electric Utilities Corp [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2014 2013 2014 2013
             
PPL Energy Supply (a) $ 23 $ 12 $ 30 $ 23
PPL Electric (a)    10   9   15   18

LG&E   2   3   4   6
KU   1   5   4   9

(a)       The three and six months ended June 30, 2014 include $16 million and $4 million of termination benefits for PPL Energy Supply and PPL Electric related to a one-time voluntary retirement window offered to certain bargaining unit employees. See Note 10 for additional information.

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 June 30:

    Pension Benefits
    Three Months Six Months
    2014 2013 2014 2013
PPL Energy Supply            
Service cost $ 2 $ 2 $ 3 $ 4
Interest cost   2   2   4   4
Expected return on plan assets   (3)   (2)   (5)   (5)
Amortization of:            
  Actuarial (gain) loss   1      1   1
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 3 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 11 $ 13
Interest cost   16   15   33   31
Expected return on plan assets   (21)   (20)   (41)   (41)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   9   6   17
Net periodic defined benefit costs (credits)  $ 4 $ 11 $ 11 $ 22
               
LG&E            
Service cost $ 1    $ 1 $ 1
Interest cost   3 $ 4   7   7
Expected return on plan assets   (5)   (5)   (10)   (10)
Amortization of:            
  Prior service cost         1   1
  Actuarial (gain) loss    2   4   3   7
Net periodic defined benefit costs (credits)  $ 1 $ 3 $ 2 $ 6

   Other Postretirement Benefits
   Three Months Six Months
   2014 2013 2014 2013
PPL            
Service cost $ 3 $ 3 $ 6 $ 7
Interest cost   8   7   16   14
Expected return on plan assets   (7)   (6)   (13)   (12)
Amortization of:            
 Actuarial (gain) loss      2      3
Net periodic defined benefit costs (credits) $ 4 $ 6 $ 9 $ 12

              
LKE            
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost   3   2   5   4
Expected return on plan assets   (2)   (1)   (3)   (2)
Amortization of:            
 Prior service cost         1   1
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 5 $ 5
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 June 30:

    Pension Benefits
    Three Months Six Months
    2014 2013 2014 2013
PPL Energy Supply            
Service cost $ 2 $ 2 $ 3 $ 4
Interest cost   2   2   4   4
Expected return on plan assets   (3)   (2)   (5)   (5)
Amortization of:            
  Actuarial (gain) loss   1      1   1
Net periodic defined benefit costs (credits) $ 2 $ 2 $ 3 $ 4

               
LKE            
Service cost $ 5 $ 6 $ 11 $ 13
Interest cost   16   15   33   31
Expected return on plan assets   (21)   (20)   (41)   (41)
Amortization of:            
  Prior service cost   1   1   2   2
  Actuarial (gain) loss    3   9   6   17
Net periodic defined benefit costs (credits)  $ 4 $ 11 $ 11 $ 22
               
LG&E            
Service cost $ 1    $ 1 $ 1
Interest cost   3 $ 4   7   7
Expected return on plan assets   (5)   (5)   (10)   (10)
Amortization of:            
  Prior service cost         1   1
  Actuarial (gain) loss    2   4   3   7
Net periodic defined benefit costs (credits)  $ 1 $ 3 $ 2 $ 6
Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2014 2013 2014 2013
             
PPL Energy Supply (a) $ 23 $ 12 $ 30 $ 23
PPL Electric (a)    10   9   15   18

LG&E   2   3   4   6
KU   1   5   4   9
Kentucky Utilities Co [Member]
  
Defined Benefits [Line Items]  
Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2014 2013 2014 2013
             
PPL Energy Supply (a) $ 23 $ 12 $ 30 $ 23
PPL Electric (a)    10   9   15   18

LG&E   2   3   4   6
KU   1   5   4   9