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Financing Activities (Tables)
 3 Months Ended
Mar. 31, 2014
Financing Activities [Line Items]  
Credit Facilities in Place at Period End

The following credit facilities were in place at:

       March 31, 2014 December 31, 2013
                Letters of      Letters of
                Credit        Credit
                and       and
                Commercial       Commercial
       Expiration      Paper Unused   Paper
        Date Capacity Borrowed Issued Capacity Borrowed Issued
PPL                     
U.K.                    
                      
  PPL WW Syndicated                    
   Credit Facility  Dec. 2016 £ 210 £ 98    £ 112 £ 103   
  WPD (South West)                     
   Syndicated Credit Facility Jan. 2017   245         245      
  WPD (East Midlands)                     
   Syndicated Credit Facility Apr. 2016   300         300      
  WPD (West Midlands)                    
   Syndicated Credit Facility  Apr. 2016   300         300      
  Uncommitted Credit Facilities     88    £ 5   83    £ 5
   Total U.K. Credit Facilities (a)   £ 1,143 £ 98 £ 5 £ 1,040 £ 103 £ 5
                           
U.S.                    
 PPL Capital Funding                    
  Syndicated Credit Facility (b) Nov. 2018 $ 300 $ 185    $ 115 $ 270   
  Bilateral Credit Facility  Mar. 2015   150         150      
   Total PPL Capital Funding Credit Facilities   $ 450 $ 185    $ 265 $ 270   
                           
PPL Energy Supply                     
 Syndicated Credit Facility (b) Nov. 2017 $ 3,000 $ 350 $ 730 $ 1,920    $ 29
 Letter of Credit Facility  Mar. 2015   150      91   59      138
 Uncommitted Credit Facilities      175      77   98      77
   Total PPL Energy Supply Credit Facilities   $ 3,325 $ 350 $ 898 $ 2,077    $ 244
                           
PPL Electric                     
 Syndicated Credit Facility  Oct. 2017 $ 300    $ 61 $ 239    $ 21
                           
LKE                    
 Syndicated Credit Facility (b) Oct. 2018 $ 75 $ 75       $ 75   
                           
LG&E                     
 Syndicated Credit Facility  Nov. 2017 $ 500    $ 15 $ 485    $ 20
                           
KU                     
 Syndicated Credit Facility  Nov. 2017 $ 400    $ 110 $ 290    $ 150
 Letter of Credit Facility  May 2016   198      198         198
   Total KU Credit Facilities   $ 598    $ 308 $ 290    $ 348

(a)       PPL WW's amounts borrowed at March 31, 2014 and December 31, 2013 were USD-denominated borrowings of $164 million and $166 million, which equated to £98 million and £103 million at the time of borrowings and bore interest at 1.86% and 1.87%. At March 31, 2014, the unused capacity under the U.K. credit facilities was $1.7 billion.

(b)       At March 31, 2014, interest rates on outstanding borrowings were 1.79% for PPL Capital Funding and 1.66% for PPL Energy Supply and LKE. At December 31, 2013, interest rates on outstanding borrowings were 1.79% for PPL Capital Funding and 1.67% for LKE.

PPL Energy Supply LLC [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

 March 31, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.48% $ 750 $ 620 $ 130      
 PPL Electric 0.33%   300   60   240  0.23% $ 20
 LG&E  0.27%   350   15   335  0.29%   20
 KU  0.29%   350   110   240  0.32%   150
   Total    $ 1,750 $ 805 $ 945    $ 190
PPL Electric Utilities Corp [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

 March 31, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.48% $ 750 $ 620 $ 130      
 PPL Electric 0.33%   300   60   240  0.23% $ 20
 LG&E  0.27%   350   15   335  0.29%   20
 KU  0.29%   350   110   240  0.32%   150
   Total    $ 1,750 $ 805 $ 945    $ 190
Louisville Gas And Electric Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

 March 31, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.48% $ 750 $ 620 $ 130      
 PPL Electric 0.33%   300   60   240  0.23% $ 20
 LG&E  0.27%   350   15   335  0.29%   20
 KU  0.29%   350   110   240  0.32%   150
   Total    $ 1,750 $ 805 $ 945    $ 190
Kentucky Utilities Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

 March 31, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.48% $ 750 $ 620 $ 130      
 PPL Electric 0.33%   300   60   240  0.23% $ 20
 LG&E  0.27%   350   15   335  0.29%   20
 KU  0.29%   350   110   240  0.32%   150
   Total    $ 1,750 $ 805 $ 945    $ 190