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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill and Other Intangible Assets [Abstract]  
Goodwill Rollforward
20. Goodwill and Other Intangible Assets
                            
Goodwill
                            
(PPL and PPL Energy Supply)
                            
The changes in the carrying amount of goodwill by segment were:
                            
     Kentucky Regulated U.K. Regulated Supply Total
     2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Balance at beginning of period (a) $ 662 $ 662 $ 3,032 $ 679 $ 420 $ 420 $ 4,114 $ 1,761
 Goodwill recognized during the period (b)         (14)   2,391         (14)   2,391
 Effect of foreign currency exchange rates         58   (38)         58   (38)
Balance at end of period (a) $ 662 $ 662 $ 3,076 $ 3,032 $ 420 $ 420 $ 4,158 $ 4,114
                            
PPL Energy Supply                        
Balance at beginning of period (a)          $ 679 $ 86 $ 86 $ 86 $ 765
 Derecognition (c)            (679)            (679)
Balance at end of period (a)          $  $ 86 $ 86 $ 86 $ 86

(a)       There were no accumulated impairment losses related to goodwill.

(b)       Represents goodwill recognized as a result of the acquisition of WPD Midlands. See Note 10 for additional information.

 
Other Intangible Assets
Other Intangibles
               
(PPL)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Contracts (a) (b) (c) $ 408 $ 150 $ 611 $ 155
 Land and transmission rights    284   113   263   110
 Emission allowances/RECs (d) (e) (f)   17      20   
 Licenses and other (g)   287   39   265   35
Total subject to amortization   996   302   1,159   300
               
Not subject to amortization due to indefinite life:            
 Land and transmission rights   18      16   
 Easements (h)   220      199   
Total not subject to amortization due to indefinite life    238      215   
Total $ 1,234 $ 302 $ 1,374 $ 300

(a)       In 2012, intangible assets related to a tolling agreement were eliminated in consolidation as a result of the Ironwood Acquisition. See Note 10 for additional information.

(b)       Gross carrying amount for 2011 includes $10 million, which represents the fair value of customer contracts with terms favorable to market recognized as a result of the 2011 acquisition of WPD Midlands. The weighted-average amortization period of these contracts was ten years at the acquisition date. See Note 10 for additional information.

(c)       The gross carrying amount includes $269 million of coal contracts related to LKE, which represents the fair value of contracts with terms that are favorable to market recognized as a result of the 2010 acquisition of LKE by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

(d)       PPL Energy Supply emission allowances/RECs are expensed when consumed or sold. Consumption expense was $12 million, $16 million, and $45 million in 2012, 2011 and 2010. Consumption expense is expected to be insignificant in future periods.

(e)       Includes emission allowances of LKE. An offsetting regulatory liability is recorded related to these emission allowances, which is being amortized as the emission allowances are consumed, eliminating any income statement impact. The carrying amounts of these emission allowances were insignificant at December 31, 2012 and 2011. Consumption related to these emission allowances was insignificant in 2012 and $11 million in 2011.

(f)       During 2011, PPL recorded $7 million of impairment charges. See Note 18 for additional information.

(g)       "Other" includes costs for the development of licenses, the most significant of which is the COLA. Amortization of these costs begins when the related asset is placed in service. See Note 8 for additional information on the COLA.

(h)       Gross carrying amount for 2011 includes $88 million, which represents the fair value of easements recognized as a result of the 2011 acquisition of WPD Midlands. See Note 10 for additional information.

Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits
Amortization expense, excluding consumption of emission allowances/RECs, was as follows:
          
   2012  2011  2010
          
Intangible assets with no regulatory offset $ 14 $ 25 $ 24
Intangible assets with regulatory offset   47   87   11
Total $ 61 $ 112 $ 35
Future Amortization Expense
Amortization expense for each of the next five years, excluding consumption of emission allowances/RECs, is estimated to be:
                
   2013  2014  2015  2016  2017
                
Intangible assets with no regulatory offset $ 10 $ 10 $ 10 $ 8 $ 8
Intangible assets with a regulatory offset   52   46   51   27   9
Total $ 62 $ 56 $ 61 $ 35 $ 17
PPL Energy Supply LLC [Member]
  
Goodwill and Other Intangible Assets [Abstract]  
Goodwill Rollforward
20. Goodwill and Other Intangible Assets
                            
Goodwill
                            
(PPL and PPL Energy Supply)
                            
The changes in the carrying amount of goodwill by segment were:
                            
     Kentucky Regulated U.K. Regulated Supply Total
     2012 2011 2012 2011 2012 2011 2012 2011
PPL                        
Balance at beginning of period (a) $ 662 $ 662 $ 3,032 $ 679 $ 420 $ 420 $ 4,114 $ 1,761
 Goodwill recognized during the period (b)         (14)   2,391         (14)   2,391
 Effect of foreign currency exchange rates         58   (38)         58   (38)
Balance at end of period (a) $ 662 $ 662 $ 3,076 $ 3,032 $ 420 $ 420 $ 4,158 $ 4,114
                            
PPL Energy Supply                        
Balance at beginning of period (a)          $ 679 $ 86 $ 86 $ 86 $ 765
 Derecognition (c)            (679)            (679)
Balance at end of period (a)          $  $ 86 $ 86 $ 86 $ 86

(a)       There were no accumulated impairment losses related to goodwill.

(b)       Represents goodwill recognized as a result of the acquisition of WPD Midlands. See Note 10 for additional information.

(c)       Represents the amount of goodwill derecognized as a result of PPL Energy Supply's distribution of its membership interest in PPL Global to PPL Energy Supply's parent, PPL Energy Funding. See Note 9 for additional information on the distribution. Subsequent to the distribution, PPL Energy Supply operates in a single reportable segment and reporting unit.

Other Intangible Assets
(PPL Energy Supply)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Contracts (a)       $ 203 $ 53
 Land and transmission rights $ 17 $ 13   17   13
 Emission allowances/RECs (b) (c)   13      15   
 Licenses and other (d)   277   35   255   30
Total subject to amortization $ 307 $ 48 $ 490 $ 96

(a)       In 2012, intangible assets related to a tolling agreement were eliminated in consolidation as a result of the Ironwood acquisition. See Note 10 for additional information.

(b)       These emission allowances/RECs are expensed when consumed or sold. Consumption expense was $12 million, $16 million, and $46 million in 2012, 2011, and 2010. Consumption expense is expected to be insignificant in future periods.

(c)       During 2011, PPL Energy Supply recorded $7 million of impairment charges. See Note 18 for additional information.

(d)       "Other" includes costs for the development of licenses, the most significant of which is the COLA. Amortization of these costs begins when the related asset is placed in service. See Note 8 for additional information on the COLA.

Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits
Amortization expense, excluding consumption of emission allowances/RECs, was as follows:
          
   2012  2011  2010
          
Amortization expense $ 9 $ 20 $ 20
Future Amortization Expense
Amortization expense for each of the next five years, excluding consumption of emission allowances/RECs, is estimated to be:
                
   2013  2014  2015  2016  2017
                
Estimated amortization expense $ 5 $ 5 $ 5 $ 3 $ 3
PPL Electric Utilities Corp [Member]
  
Goodwill and Other Intangible Assets [Abstract]  
Other Intangible Assets
(PPL Electric)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Land and transmission rights $ 249 $ 99 $ 232 $ 96
 Licenses and other   4   1   4   1
Total subject to amortization   253   100   236   97
               
Not subject to amortization due to indefinite life:            
 Land and transmission rights   18      16   
Total $ 271 $ 100 $ 252 $ 97
LG And E And KU Energy LLC [Member]
  
Goodwill and Other Intangible Assets [Abstract]  
Other Intangible Assets
(LKE)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Coal contracts (a) $ 269 $ 128 $ 269 $ 89
 Land and transmission rights (b)   18   1   14   1
 Emission allowances (c)   4      5   
 OVEC power purchase agreement (d)   126   17   126   9
Total subject to amortization $ 417 $ 146 $ 414 $ 99

(a)       Gross carrying amount represents the fair value of coal contracts with terms favorable to market recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

(b)       Gross carrying amount includes $14 million, which represents the fair value of land and transmission rights recognized as an intangible asset as a result of adopting PPL's accounting policies in the Successor period. Amortization expense is recovered through base rates and is expected to be insignificant for future periods.

(c)       Represents the fair value of emission allowances recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability is recorded related to these emission allowances, which is being amortized as the emission allowances are consumed, eliminating any income statement impact. Consumption related to these emission allowances was insignificant in 2012 and $11 million in 2011.

(d)       Gross carrying amount represents the fair value of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. See Note 6 for additional information.

Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits
Amortization expense for the Successor, excluding consumption of emission allowances, was as follows:
          
   2012  2011  2010
          
Intangible assets with no regulatory offset    $ 1   
Intangible assets with regulatory offset $ 47   87 $ 11
Total $ 47 $ 88 $ 11
          
Future Amortization Expense
Amortization expense for each of the next five years, excluding consumption of emission allowances, is estimated to be:
                
   2013  2014  2015  2016  2017
                
Intangibles with regulatory offset $ 52 $ 46 $ 51 $ 27 $ 9
Louisville Gas And Electric Co [Member]
  
Goodwill and Other Intangible Assets [Abstract]  
Other Intangible Assets
(LG&E)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Coal contracts (a) $ 124 $ 62 $ 124 $ 46
 Land and transmission rights (b)   8   1   6   1
 Emission allowances (c)   1      2   
 OVEC power purchase agreement (d)   87   13   87   6
Total subject to amortization $ 220 $ 76 $ 219 $ 53

(a)       Gross carrying amount represents the fair value of coal contracts with terms favorable to market recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

(b)       Gross carrying amount includes $6 million, which represents the fair value of land and transmission rights recognized as an intangible asset as a result of adopting PPL's accounting policies in the Successor period. Amortization expense is recovered through base rates and is expected to be insignificant for future periods.

(c)       Represents the fair value of emission allowances recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability is recorded related to these emission allowances, which is being amortized as the emission allowances are consumed, eliminating any income statement impact. Consumption related to these emission allowances was insignificant in 2012 and $5 million in 2011.

(d)       Gross carrying amount represents the fair value of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. See Note 6 for additional information.

Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits
Amortization expense for the Successor, excluding consumption of emission allowances, was as follows:
          
   2012  2011  2010
          
Intangible assets with no regulatory offset    $ 1   
Intangible assets with regulatory offset $ 23   45 $ 7
Total $ 23 $ 46 $ 7
          
Future Amortization Expense
Amortization expense for each of the next five years, excluding consumption of emission allowances, is estimated to be:
                
   2013  2014  2015  2016  2017
                
Intangibles with regulatory offset $ 25 $ 23 $ 24 $ 14 $ 6
Kentucky Utilities Co [Member]
  
Goodwill and Other Intangible Assets [Abstract]  
Other Intangible Assets
(KU)
               
The gross carrying amount and the accumulated amortization of other intangible assets were:
               
    December 31, 2012 December 31, 2011
    Gross    Gross   
    Carrying Accumulated Carrying Accumulated
    Amount Amortization Amount Amortization
Subject to amortization:            
 Coal contracts (a) $ 145 $ 66 $ 145 $ 43
 Land and transmission rights (b)   10      8   
 Emission allowances (c)   3      3   
 OVEC power purchase agreement (d)   39   4   39   3
Total subject to amortization $ 197 $ 70 $ 195 $ 46

(a)       Gross carrying amount represents the fair value of coal contracts with terms favorable to market recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

(b)       Gross carrying amount includes $8 million, which represents the fair value of land and transmission rights recognized as an intangible asset as a result of adopting PPL's accounting policies in the Successor period. Amortization expense is recovered through base rates and is expected to be insignificant for future periods.

(c)       Represents the fair value of emission allowances recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability is recorded related to these emission allowances, which is being amortized as the emission allowances are consumed, eliminating any income statement impact. Consumption related to these emission allowances was $6 million for 2011. KU had no consumption related to these emission allowances in 2012.

(d)       Gross carrying amount represents the fair value of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. See Note 6 for additional information.

Amortization Expense, Excluding Consumption of Emission Allowances / Renewable Energy Credits
Amortization expense for the Successor, excluding consumption of emission allowances, was as follows:
          
   2012  2011  2010
          
Intangible assets with regulatory offset $ 24 $ 42 $ 4
Future Amortization Expense
Amortization expense for each of the next five years, excluding consumption of emission allowances, is estimated to be:
                
   2013  2014  2015  2016  2017
                
Intangibles with regulatory offset $ 27 $ 23 $ 27 $ 13 $ 3