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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]  
Accumulated Other Comprehensive Income (Loss)

The after-tax changes in AOCI by component for the periods ended June 30 were as follows.

  Foreign Unrealized gains (losses)    Defined benefit plans   
  currency Available-    Equity Prior Actuarial Transition   
  translation for-sale Qualifying investees' service gain asset   
  adjustments securities derivatives AOCI costs (loss) (obligation) Total
PPL                        
March 31, 2014$ 120 $ 177 $ 67 $ 1 $ (5) $ (1,790) $ 1 $ (1,429)
Amounts arising during the period  (3)   14   (1)         (2)      8
Reclassifications from AOCI     (1)   (5)      1   28      23
Net OCI during the period  (3)   13   (6)      1   26      31
June 30, 2014$ 117 $ 190 $ 61 $ 1 $ (4) $ (1,764) $ 1 $ (1,398)
                         
December 31, 2013$ (11) $ 173 $ 94 $ 1 $ (6) $ (1,817) $ 1 $ (1,565)
Amounts arising during the period  128   19   (47)         (2)      98
Reclassifications from AOCI     (2)   14      2   55      69
Net OCI during the period  128   17   (33)      2   53      167
June 30, 2014$ 117 $ 190 $ 61 $ 1 $ (4) $ (1,764) $ 1 $ (1,398)
                         
March 31, 2013$ (394) $ 134 $ 114 $ 1 $ (13) $ (1,989) $ 1 $ (2,146)
Amounts arising during the period  (7)   2   24               19
Reclassifications from AOCI     (1)   (36)      2   34      (1)
Net OCI during the period  (7)   1   (12)      2   34      18
June 30, 2013$ (401) $ 135 $ 102 $ 1 $ (11) $ (1,955) $ 1 $ (2,128)
                         
December 31, 2012$ (149) $ 112 $ 132 $ 1 $ (14) $ (2,023) $ 1 $ (1,940)
Amounts arising during the period  (252)   25   86               (141)
Reclassifications from AOCI     (2)   (116)      3   68      (47)
Net OCI during the period  (252)   23   (30)      3   68      (188)
June 30, 2013$ (401) $ 135 $ 102 $ 1 $ (11) $ (1,955) $ 1 $ (2,128)
                         
PPL Energy Supply                       
March 31, 2014   $ 177 $ 83    $ (3) $ (179)    $ 78
Amounts arising during the period     14                  14
Reclassifications from AOCI     (1)   (8)         2      (7)
Net OCI during the period     13   (8)         2      7
June 30, 2014   $ 190 $ 75    $ (3) $ (177)    $ 85
                         
December 31, 2013   $ 173 $ 88    $ (4) $ (180)    $ 77
Amounts arising during the period     19                  19
Reclassifications from AOCI     (2)   (13)      1   3      (11)
Net OCI during the period     17   (13)      1   3      8
June 30, 2014   $ 190 $ 75    $ (3) $ (177)    $ 85
                         
March 31, 2013   $ 134 $ 181    $ (9) $ (261)    $ 45
Amounts arising during the period     2                  2
Reclassifications from AOCI     (1)   (37)      1   4      (33)
Net OCI during the period     1   (37)      1   4      (31)
June 30, 2013   $ 135 $ 144    $ (8) $ (257)    $ 14
                         
December 31, 2012   $ 112 $ 211    $ (10) $ (265)    $ 48
Amounts arising during the period     25                  25
Reclassifications from AOCI     (2)   (67)      2   8      (59)
Net OCI during the period     23   (67)      2   8      (34)
June 30, 2013   $ 135 $ 144    $ (8) $ (257)    $ 14

The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended June 30.

   Three Months  
   PPL PPL Energy Supply Affected Line Item on the
Details about AOCI 2014 2013 2014 2013 Statements of Income
                
Available-for-sale securities $ 2 $ 1 $ 2 $ 1 Other Income (Expense) - net
Total Pre-tax   2   1   2   1  
Income Taxes   (1)      (1)     
Total After-tax   1   1   1   1  
                
Qualifying derivatives              
 Interest rate swaps   (4)   (4)       Interest Expense
 Cross-currency swaps      1       Other Income (Expense) - net
     1   1       Interest Expense
 Energy commodities   5   73   5   73 Unregulated wholesale energy
     8   (14)   8   (14) Energy purchases
        1      1 Other
Total Pre-tax   10   58   13   60  
Income Taxes   (5)   (22)   (5)   (23)  
Total After-tax   5   36   8   37  
                
Defined benefit plans              
 Prior service costs    (2)   (3)      (1)  
 Net actuarial loss    (36)   (46)   (3)   (7)  
Total Pre-tax   (38)   (49)   (3)   (8)  
Income Taxes   9   13   1   3  
Total After-tax   (29)   (36)   (2)   (5)  
                
Total reclassifications during the period $ (23) $ 1 $ 7 $ 33  
                
                
   Six Months  
   PPL PPL Energy Supply Affected Line Item on the
Details about AOCI 2014 2013 2014 2013 Statements of Income
                
Available-for-sale securities $ 4 $ 3 $ 4 $ 3 Other Income (Expense) - net
Total Pre-tax   4   3   4   3  
Income Taxes   (2)   (1)   (2)   (1)  
Total After-tax   2   2   2   2  
                
Qualifying derivatives              
 Interest rate swaps   (7)   (9)       Interest Expense
 Cross-currency swaps   (29)   70       Other Income (Expense) - net
     1   1       Interest Expense
 Energy commodities   6   140   6   140 Unregulated wholesale energy
     15   (30)   15   (30) Energy purchases
     1   1   1   1 Other
Total Pre-tax   (13)   173   22   111  
Income Taxes   (1)   (57)   (9)   (44)  
Total After-tax   (14)   116   13   67  
                
Defined benefit plans              
 Prior service costs    (4)   (5)   (2)   (3)  
 Net actuarial loss    (72)   (93)   (5)   (13)  
Total Pre-tax   (76)   (98)   (7)   (16)  
Income Taxes   19   27   3   6  
Total After-tax   (57)   (71)   (4)   (10)  
                
Total reclassifications during the period $ (69) $ 47 $ 11 $ 59  
PPL Energy Supply LLC [Member]
  
Accumulated Other Comprehensive Income Loss [Line Items]  
Accumulated Other Comprehensive Income (Loss)

The after-tax changes in AOCI by component for the periods ended June 30 were as follows.

  Foreign Unrealized gains (losses)    Defined benefit plans   
  currency Available-    Equity Prior Actuarial Transition   
  translation for-sale Qualifying investees' service gain asset   
  adjustments securities derivatives AOCI costs (loss) (obligation) Total
PPL                        
March 31, 2014$ 120 $ 177 $ 67 $ 1 $ (5) $ (1,790) $ 1 $ (1,429)
Amounts arising during the period  (3)   14   (1)         (2)      8
Reclassifications from AOCI     (1)   (5)      1   28      23
Net OCI during the period  (3)   13   (6)      1   26      31
June 30, 2014$ 117 $ 190 $ 61 $ 1 $ (4) $ (1,764) $ 1 $ (1,398)
                         
December 31, 2013$ (11) $ 173 $ 94 $ 1 $ (6) $ (1,817) $ 1 $ (1,565)
Amounts arising during the period  128   19   (47)         (2)      98
Reclassifications from AOCI     (2)   14      2   55      69
Net OCI during the period  128   17   (33)      2   53      167
June 30, 2014$ 117 $ 190 $ 61 $ 1 $ (4) $ (1,764) $ 1 $ (1,398)
                         
March 31, 2013$ (394) $ 134 $ 114 $ 1 $ (13) $ (1,989) $ 1 $ (2,146)
Amounts arising during the period  (7)   2   24               19
Reclassifications from AOCI     (1)   (36)      2   34      (1)
Net OCI during the period  (7)   1   (12)      2   34      18
June 30, 2013$ (401) $ 135 $ 102 $ 1 $ (11) $ (1,955) $ 1 $ (2,128)
                         
December 31, 2012$ (149) $ 112 $ 132 $ 1 $ (14) $ (2,023) $ 1 $ (1,940)
Amounts arising during the period  (252)   25   86               (141)
Reclassifications from AOCI     (2)   (116)      3   68      (47)
Net OCI during the period  (252)   23   (30)      3   68      (188)
June 30, 2013$ (401) $ 135 $ 102 $ 1 $ (11) $ (1,955) $ 1 $ (2,128)
                         
PPL Energy Supply                       
March 31, 2014   $ 177 $ 83    $ (3) $ (179)    $ 78
Amounts arising during the period     14                  14
Reclassifications from AOCI     (1)   (8)         2      (7)
Net OCI during the period     13   (8)         2      7
June 30, 2014   $ 190 $ 75    $ (3) $ (177)    $ 85
                         
December 31, 2013   $ 173 $ 88    $ (4) $ (180)    $ 77
Amounts arising during the period     19                  19
Reclassifications from AOCI     (2)   (13)      1   3      (11)
Net OCI during the period     17   (13)      1   3      8
June 30, 2014   $ 190 $ 75    $ (3) $ (177)    $ 85
                         
March 31, 2013   $ 134 $ 181    $ (9) $ (261)    $ 45
Amounts arising during the period     2                  2
Reclassifications from AOCI     (1)   (37)      1   4      (33)
Net OCI during the period     1   (37)      1   4      (31)
June 30, 2013   $ 135 $ 144    $ (8) $ (257)    $ 14
                         
December 31, 2012   $ 112 $ 211    $ (10) $ (265)    $ 48
Amounts arising during the period     25                  25
Reclassifications from AOCI     (2)   (67)      2   8      (59)
Net OCI during the period     23   (67)      2   8      (34)
June 30, 2013   $ 135 $ 144    $ (8) $ (257)    $ 14

The following table presents the gains (losses) and related income taxes for reclassifications from AOCI for the periods ended June 30.

   Three Months  
   PPL PPL Energy Supply Affected Line Item on the
Details about AOCI 2014 2013 2014 2013 Statements of Income
                
Available-for-sale securities $ 2 $ 1 $ 2 $ 1 Other Income (Expense) - net
Total Pre-tax   2   1   2   1  
Income Taxes   (1)      (1)     
Total After-tax   1   1   1   1  
                
Qualifying derivatives              
 Interest rate swaps   (4)   (4)       Interest Expense
 Cross-currency swaps      1       Other Income (Expense) - net
     1   1       Interest Expense
 Energy commodities   5   73   5   73 Unregulated wholesale energy
     8   (14)   8   (14) Energy purchases
        1      1 Other
Total Pre-tax   10   58   13   60  
Income Taxes   (5)   (22)   (5)   (23)  
Total After-tax   5   36   8   37  
                
Defined benefit plans              
 Prior service costs    (2)   (3)      (1)  
 Net actuarial loss    (36)   (46)   (3)   (7)  
Total Pre-tax   (38)   (49)   (3)   (8)  
Income Taxes   9   13   1   3  
Total After-tax   (29)   (36)   (2)   (5)  
                
Total reclassifications during the period $ (23) $ 1 $ 7 $ 33  
                
                
   Six Months  
   PPL PPL Energy Supply Affected Line Item on the
Details about AOCI 2014 2013 2014 2013 Statements of Income
                
Available-for-sale securities $ 4 $ 3 $ 4 $ 3 Other Income (Expense) - net
Total Pre-tax   4   3   4   3  
Income Taxes   (2)   (1)   (2)   (1)  
Total After-tax   2   2   2   2  
                
Qualifying derivatives              
 Interest rate swaps   (7)   (9)       Interest Expense
 Cross-currency swaps   (29)   70       Other Income (Expense) - net
     1   1       Interest Expense
 Energy commodities   6   140   6   140 Unregulated wholesale energy
     15   (30)   15   (30) Energy purchases
     1   1   1   1 Other
Total Pre-tax   (13)   173   22   111  
Income Taxes   (1)   (57)   (9)   (44)  
Total After-tax   (14)   116   13   67  
                
Defined benefit plans              
 Prior service costs    (4)   (5)   (2)   (3)  
 Net actuarial loss    (72)   (93)   (5)   (13)  
Total Pre-tax   (76)   (98)   (7)   (16)  
Income Taxes   19   27   3   6  
Total After-tax   (57)   (71)   (4)   (10)  
                
Total reclassifications during the period $ (69) $ 47 $ 11 $ 59