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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 ##D<QtrEndNoComma>:

    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 ##D<QtrEndNoComma>:

    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 ##D<QtrEndNoComma>, 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 ##D<QtrEndNoComma>, 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 ##D<QtrEndNoComma>:

    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 ##D<QtrEndNoComma>:

    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 ##D<QtrEndNoComma>, 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 ##D<QtrEndNoComma>, 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