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Financing Activities (Tables)
 6 Months Ended
Jun. 30, 2014
Financing Activities [Line Items]  
Credit Facilities in Place at Period End

The following credit facilities were in place at:

       June 30, 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 £ 97    £ 113 £ 103   
  WPD (South West)                     
   Syndicated Credit Facility (c) Jan. 2017   245         245      
  WPD (East Midlands)                     
   Syndicated Credit Facility (c) Apr. 2016   300         300      
  WPD (West Midlands)                    
   Syndicated Credit Facility (c)  Apr. 2016   300         300      
  Uncommitted Credit Facilities     105    £ 5   100    £ 5
   Total U.K. Credit Facilities (a)   £ 1,160 £ 97 £ 5 £ 1,058 £ 103 £ 5
                           
U.S.                    
 PPL Capital Funding                    
  Syndicated Credit Facility (b) Nov. 2018 $ 300       $ 300 $ 270   
  Bilateral Credit Facility  Mar. 2015   150    $ 11   139      
   Total PPL Capital Funding Credit Facilities   $ 450    $ 11 $ 439 $ 270   
                           
PPL Energy Supply                     
 Syndicated Credit Facility (b)  Nov. 2017 $ 3,000 $ 175 $ 264 $ 2,561    $ 29
 Letter of Credit Facility  Mar. 2015   150      143   7      138
 Uncommitted Credit Facilities (c)     175      77   98      77
   Total PPL Energy Supply Credit Facilities  $ 3,325 $ 175 $ 484 $ 2,666    $ 244
                           
PPL Electric                     
 Syndicated Credit Facility (c) Oct. 2017 $ 300    $ 1 $ 299    $ 21
                           
LKE                    
 Syndicated Credit Facility (b) Oct. 2018 $ 75 $ 75       $ 75   
                           
LG&E                     
 Syndicated Credit Facility (c) Nov. 2017 $ 500    $ 70 $ 430    $ 20
                           
KU                     
 Syndicated Credit Facility (c) Nov. 2017 $ 400    $ 175 $ 225    $ 150
 Letter of Credit Facility  May 2016   198      198         198
   Total KU Credit Facilities   $ 598    $ 373 $ 225    $ 348

(a)       PPL WW's amounts borrowed at June 30, 2014 and December 31, 2013 were USD-denominated borrowings of $164 million and $166 million, which bore interest at 1.85% and 1.87%. At June 30, 2014, the unused capacity under the U.K. credit facilities was $1.8 billion.

(b)       At June 30, 2014, interest rates on outstanding borrowings were 2.04% for PPL Energy Supply and 1.65% for LKE. At December 31, 2013, interest rates on outstanding borrowings were 1.79% for PPL Capital Funding and 1.67% for LKE.

(c)       In July 2014, the expiration dates for the WPD (South West), WPD (East Midlands), WPD (West Midlands), LG&E and KU syndicated credit facilities were extended to July 2019 and the PPL Electric syndicated credit facility was extended to October 2018. Also, in July 2014, PPL Energy Supply extended the expiration date for its uncommitted credit facility to July 2015.

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

The following commercial paper programs were in place at:

       June 30, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.75% $ 750 $ 149 $ 601      
 PPL Electric     300      300  0.23% $ 20
 LG&E  0.29%   350   70   280  0.29%   20
 KU  0.29%   350   175   175  0.32%   150
   Total    $ 1,750 $ 394 $ 1,356    $ 190
PPL Electric Utilities Corp [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       June 30, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.75% $ 750 $ 149 $ 601      
 PPL Electric     300      300  0.23% $ 20
 LG&E  0.29%   350   70   280  0.29%   20
 KU  0.29%   350   175   175  0.32%   150
   Total    $ 1,750 $ 394 $ 1,356    $ 190
Louisville Gas And Electric Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       June 30, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.75% $ 750 $ 149 $ 601      
 PPL Electric     300      300  0.23% $ 20
 LG&E  0.29%   350   70   280  0.29%   20
 KU  0.29%   350   175   175  0.32%   150
   Total    $ 1,750 $ 394 $ 1,356    $ 190
Kentucky Utilities Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       June 30, 2014 December 31, 2013
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
                        
 PPL Energy Supply 0.75% $ 750 $ 149 $ 601      
 PPL Electric     300      300  0.23% $ 20
 LG&E  0.29%   350   70   280  0.29%   20
 KU  0.29%   350   175   175  0.32%   150
   Total    $ 1,750 $ 394 $ 1,356    $ 190