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

    Pension Benefits
    Three Months Six Months
    U.S. U.K. U.S. U.K.
    2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Service cost $ 26 $ 23 $ 14 $ 12 $ 52 $ 47 $ 27 $ 17
Interest cost   54   54   85   73   110   109   169   112
Expected return on plan assets   (64)   (61)   (114)   (88)   (130)   (123)   (225)   (140)
Amortization of:                        
  Prior service cost   6   6   1   1   12   12   2   2
  Actuarial (gain) loss    11   8   20   15   21   14   40   29
Net periodic defined benefit                         
 costs (credits) prior to                        
 termination benefits   33   30   6   13   65   59   13   20
Termination benefits            2            2
Net periodic defined benefit                         
 costs (credits) $ 33 $ 30 $ 6 $ 15 $ 65 $ 59 $ 13 $ 22
                           
PPL Energy Supply                        
Service cost $ 2 $ 1       $ 3 $ 2      
Interest cost   2   2         4   4      
Expected return on plan assets   (3)   (2)         (5)   (4)      
Amortization of:                        
  Actuarial (gain) loss      1         1   1      
Net periodic defined benefit                         
 costs (credits) $ 1 $ 2       $ 3 $ 3      

                       
    Pension Benefits      
    Three Months   Six Months  
    2012 2011     2012 2011    
                           
LKE                        
Service cost $ 5 $ 6       $ 11 $ 12      
Interest cost   15   17         32   34      
Expected return on plan assets   (17)   (16)         (35)   (32)      
Amortization of:                        
 Prior service cost   1   1         2   2      
 Actuarial (gain) loss    6   6         11   11      
Net periodic defined benefit                         
  costs (credits)  $ 10 $ 14       $ 21 $ 27      
                           
LG&E                        
Service cost $ 1 $ 1       $ 1 $ 1      
Interest cost   3   3         7   7      
Expected return on plan assets   (4)   (5)         (9)   (9)      
Amortization of:                        
 Prior service cost      1         1   1      
 Actuarial (gain) loss    2   3         5   6      
Net periodic defined benefit                        
  costs (credits)  $ 2 $ 3       $ 5 $ 6      

   Other Postretirement Benefits
   Three Months Six Months
   2012 2011 2012 2011
              
PPL            
Service cost $ 3 $ 3 $ 6 $ 6
Interest cost   8   8   16   16
Expected return on plan assets   (5)   (5)   (11)   (11)
Amortization of:            
 Transition obligation      1   1   1
 Actuarial (gain) loss   1   1   2   3
Net periodic defined benefit costs (credits) $ 7 $ 8 $ 14 $ 15

              
LKE            
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost   2   2   4   5
Expected return on plan assets   (1)   (1)   (2)   (2)
Amortization of:            
 Transition obligation   1   1   1   1
 Prior service cost   1      2   1
 Actuarial (gain) loss   (1)      (1)   
Net periodic defined benefit costs (credits) $ 3 $ 3 $ 6 $ 7
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
    U.S. U.K. U.S. U.K.
    2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Service cost $ 26 $ 23 $ 14 $ 12 $ 52 $ 47 $ 27 $ 17
Interest cost   54   54   85   73   110   109   169   112
Expected return on plan assets   (64)   (61)   (114)   (88)   (130)   (123)   (225)   (140)
Amortization of:                        
  Prior service cost   6   6   1   1   12   12   2   2
  Actuarial (gain) loss    11   8   20   15   21   14   40   29
Net periodic defined benefit                         
 costs (credits) prior to                        
 termination benefits   33   30   6   13   65   59   13   20
Termination benefits            2            2
Net periodic defined benefit                         
 costs (credits) $ 33 $ 30 $ 6 $ 15 $ 65 $ 59 $ 13 $ 22
                           
PPL Energy Supply                        
Service cost $ 2 $ 1       $ 3 $ 2      
Interest cost   2   2         4   4      
Expected return on plan assets   (3)   (2)         (5)   (4)      
Amortization of:                        
  Actuarial (gain) loss      1         1   1      
Net periodic defined benefit                         
 costs (credits) $ 1 $ 2       $ 3 $ 3      

                       
    Pension Benefits      
    Three Months   Six Months  
    2012 2011     2012 2011    
                           
LKE                        
Service cost $ 5 $ 6       $ 11 $ 12      
Interest cost   15   17         32   34      
Expected return on plan assets   (17)   (16)         (35)   (32)      
Amortization of:                        
 Prior service cost   1   1         2   2      
 Actuarial (gain) loss    6   6         11   11      
Net periodic defined benefit                         
  costs (credits)  $ 10 $ 14       $ 21 $ 27      
                           
LG&E                        
Service cost $ 1 $ 1       $ 1 $ 1      
Interest cost   3   3         7   7      
Expected return on plan assets   (4)   (5)         (9)   (9)      
Amortization of:                        
 Prior service cost      1         1   1      
 Actuarial (gain) loss    2   3         5   6      
Net periodic defined benefit                        
  costs (credits)  $ 2 $ 3       $ 5 $ 6      
Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 9 $ 8 $ 19 $ 15
PPL Electric   7   6   15   12

LG&E   3   4   6   8
KU   5   5   9   11
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 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 Six Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 9 $ 8 $ 19 $ 15
PPL Electric   7   6   15   12

LG&E   3   4   6   8
KU   5   5   9   11
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
    U.S. U.K. U.S. U.K.
    2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Service cost $ 26 $ 23 $ 14 $ 12 $ 52 $ 47 $ 27 $ 17
Interest cost   54   54   85   73   110   109   169   112
Expected return on plan assets   (64)   (61)   (114)   (88)   (130)   (123)   (225)   (140)
Amortization of:                        
  Prior service cost   6   6   1   1   12   12   2   2
  Actuarial (gain) loss    11   8   20   15   21   14   40   29
Net periodic defined benefit                         
 costs (credits) prior to                        
 termination benefits   33   30   6   13   65   59   13   20
Termination benefits            2            2
Net periodic defined benefit                         
 costs (credits) $ 33 $ 30 $ 6 $ 15 $ 65 $ 59 $ 13 $ 22
                           
PPL Energy Supply                        
Service cost $ 2 $ 1       $ 3 $ 2      
Interest cost   2   2         4   4      
Expected return on plan assets   (3)   (2)         (5)   (4)      
Amortization of:                        
  Actuarial (gain) loss      1         1   1      
Net periodic defined benefit                         
 costs (credits) $ 1 $ 2       $ 3 $ 3      

                       
    Pension Benefits      
    Three Months   Six Months  
    2012 2011     2012 2011    
                           
LKE                        
Service cost $ 5 $ 6       $ 11 $ 12      
Interest cost   15   17         32   34      
Expected return on plan assets   (17)   (16)         (35)   (32)      
Amortization of:                        
 Prior service cost   1   1         2   2      
 Actuarial (gain) loss    6   6         11   11      
Net periodic defined benefit                         
  costs (credits)  $ 10 $ 14       $ 21 $ 27      
                           
LG&E                        
Service cost $ 1 $ 1       $ 1 $ 1      
Interest cost   3   3         7   7      
Expected return on plan assets   (4)   (5)         (9)   (9)      
Amortization of:                        
 Prior service cost      1         1   1      
 Actuarial (gain) loss    2   3         5   6      
Net periodic defined benefit                        
  costs (credits)  $ 2 $ 3       $ 5 $ 6      

   Other Postretirement Benefits
   Three Months Six Months
   2012 2011 2012 2011
              
PPL            
Service cost $ 3 $ 3 $ 6 $ 6
Interest cost   8   8   16   16
Expected return on plan assets   (5)   (5)   (11)   (11)
Amortization of:            
 Transition obligation      1   1   1
 Actuarial (gain) loss   1   1   2   3
Net periodic defined benefit costs (credits) $ 7 $ 8 $ 14 $ 15

              
LKE            
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost   2   2   4   5
Expected return on plan assets   (1)   (1)   (2)   (2)
Amortization of:            
 Transition obligation   1   1   1   1
 Prior service cost   1      2   1
 Actuarial (gain) loss   (1)      (1)   
Net periodic defined benefit costs (credits) $ 3 $ 3 $ 6 $ 7
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
    U.S. U.K. U.S. U.K.
    2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Service cost $ 26 $ 23 $ 14 $ 12 $ 52 $ 47 $ 27 $ 17
Interest cost   54   54   85   73   110   109   169   112
Expected return on plan assets   (64)   (61)   (114)   (88)   (130)   (123)   (225)   (140)
Amortization of:                        
  Prior service cost   6   6   1   1   12   12   2   2
  Actuarial (gain) loss    11   8   20   15   21   14   40   29
Net periodic defined benefit                         
 costs (credits) prior to                        
 termination benefits   33   30   6   13   65   59   13   20
Termination benefits            2            2
Net periodic defined benefit                         
 costs (credits) $ 33 $ 30 $ 6 $ 15 $ 65 $ 59 $ 13 $ 22
                           
PPL Energy Supply                        
Service cost $ 2 $ 1       $ 3 $ 2      
Interest cost   2   2         4   4      
Expected return on plan assets   (3)   (2)         (5)   (4)      
Amortization of:                        
  Actuarial (gain) loss      1         1   1      
Net periodic defined benefit                         
 costs (credits) $ 1 $ 2       $ 3 $ 3      

                       
    Pension Benefits      
    Three Months   Six Months  
    2012 2011     2012 2011    
                           
LKE                        
Service cost $ 5 $ 6       $ 11 $ 12      
Interest cost   15   17         32   34      
Expected return on plan assets   (17)   (16)         (35)   (32)      
Amortization of:                        
 Prior service cost   1   1         2   2      
 Actuarial (gain) loss    6   6         11   11      
Net periodic defined benefit                         
  costs (credits)  $ 10 $ 14       $ 21 $ 27      
                           
LG&E                        
Service cost $ 1 $ 1       $ 1 $ 1      
Interest cost   3   3         7   7      
Expected return on plan assets   (4)   (5)         (9)   (9)      
Amortization of:                        
 Prior service cost      1         1   1      
 Actuarial (gain) loss    2   3         5   6      
Net periodic defined benefit                        
  costs (credits)  $ 2 $ 3       $ 5 $ 6      
Allocation of Net Periodic Benefit Costs

For the periods ended June 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 Six Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 9 $ 8 $ 19 $ 15
PPL Electric   7   6   15   12

LG&E   3   4   6   8
KU   5   5   9   11
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 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 Six Months
  2012 2011 2012 2011
             
PPL Energy Supply $ 9 $ 8 $ 19 $ 15
PPL Electric   7   6   15   12

LG&E   3   4   6   8
KU   5   5   9   11