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Financing Activities (Tables)
 9 Months Ended
Sep. 30, 2013
Financing Activities [Line Items]  
Credit Facilities in Place at Period End

The following credit facilities were in place at:

       September 30, 2013 December 31, 2012
                Letters of      Letters of
                Credit Issued       Credit Issued
                and       and
                Commercial       Commercial
       Expiration      Paper Unused   Paper
        Date Capacity Borrowed Backup Capacity Borrowed Backup
PPL                     
 WPD Credit Facilities                    
  PPL WW Syndicated                    
   Credit Facility (a) (b) Dec. 2016 £ 210 £ 106  n/a £ 104 £ 106  n/a
  WPD (South West)                     
   Syndicated Credit Facility  Jan. 2017   245     n/a   245     n/a
  WPD (East Midlands)                     
   Syndicated Credit Facility (b) Apr. 2016   300   44      256      
  WPD (West Midlands)                    
   Syndicated Credit Facility (b) Apr. 2016   300   34      266      
  Uncommitted Credit Facilities     84    £ 5   79    £ 4
   Total WPD Credit Facilities (c)   £ 1,139 £ 184 £ 5 £ 950 £ 106 £ 4
                           
PPL Energy Supply                     
 Syndicated Credit Facility  Nov. 2017 $ 3,000    $ 61 $ 2,939    $ 499
 Letter of Credit Facility (d) Mar. 2014   150  n/a   109   41  n/a   132
 Uncommitted Credit Facilities (e)      175  n/a   51   124  n/a   40
   Total PPL Energy Supply Credit Facilities  $ 3,325    $ 221 $ 3,104    $ 671
                           
PPL Electric                     
 Syndicated Credit Facility  Oct. 2017 $ 300    $ 1 $ 299    $ 1
                           
LG&E                     
 Syndicated Credit Facility  Nov. 2017 $ 500    $ 72 $ 428    $ 55
                           
KU                     
 Syndicated Credit Facility  Nov. 2017 $ 400    $ 140 $ 260    $ 70
 Letter of Credit Facility (f) May 2016   198      198         198
   Total KU Credit Facilities   $ 598    $ 338 $ 260    $ 268

(a)       In December 2012, the PPL WW syndicated credit facility that was set to expire in January 2013 was replaced and the capacity was increased from £150 million.

(b)       PPL WW's amounts borrowed at September 30, 2013 and December 31, 2012 were USD-denominated borrowings of $166 million and $171 million, which equated to £106 million at the time of borrowings and bore interest at 1.89% and 0.85%. WPD (East Midlands) amount borrowed at September 30, 2013 was a GBP-denominated borrowing of £44 million, which equated to $68 million and bore interest at 1.30%. WPD (West Midlands) amount borrowed at September 30, 2013 was a GBP-denominated borrowing of £34 million, which equated to $53 million and bore interest at 1.30%.

(c)       At September 30, 2013, the USD equivalent of unused capacity under WPD's credit facilities was $1.5 billion.

(d)       In February 2013, PPL Energy Supply extended the expiration date from March 2013 and, effective April 2013, the capacity was reduced from $200 million.

(e)       In August 2013, the capacity was reduced from $200 million.

(f)       In May 2013, KU extended the letter of credit facility from April 2014.

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

The following commercial paper programs were in place at:

       September 30, 2013 December 31, 2012
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
 PPL Energy Supply   $ 750    $ 750  0.50% $ 356
 PPL Electric     300      300      
 LG&E (a) 0.28%   350 $ 72   278  0.42%   55
 KU (a) 0.28%   350   140   210  0.42%   70
   Total    $ 1,750 $ 212 $ 1,538    $ 481
Dividends/distributions paid to and capital contributions received from parent/member

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 408  $ 94 $ 116 $ 67 $ 83
Capital contributions received from parent/member   980    205   146   54   92
PPL Electric Utilities Corp [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       September 30, 2013 December 31, 2012
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
 PPL Energy Supply   $ 750    $ 750  0.50% $ 356
 PPL Electric     300      300      
 LG&E (a) 0.28%   350 $ 72   278  0.42%   55
 KU (a) 0.28%   350   140   210  0.42%   70
   Total    $ 1,750 $ 212 $ 1,538    $ 481
Dividends/distributions paid to and capital contributions received from parent/member

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 408  $ 94 $ 116 $ 67 $ 83
Capital contributions received from parent/member   980    205   146   54   92
LG And E And KU Energy LLC [Member]
  
Financing Activities [Line Items]  
Dividends/distributions paid to and capital contributions received from parent/member

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 408  $ 94 $ 116 $ 67 $ 83
Capital contributions received from parent/member   980    205   146   54   92
Louisville Gas And Electric Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       September 30, 2013 December 31, 2012
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
 PPL Energy Supply   $ 750    $ 750  0.50% $ 356
 PPL Electric     300      300      
 LG&E (a) 0.28%   350 $ 72   278  0.42%   55
 KU (a) 0.28%   350   140   210  0.42%   70
   Total    $ 1,750 $ 212 $ 1,538    $ 481

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

Dividends/distributions paid to and capital contributions received from parent/member

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 408  $ 94 $ 116 $ 67 $ 83
Capital contributions received from parent/member   980    205   146   54   92
Kentucky Utilities Co [Member]
  
Financing Activities [Line Items]  
Commercial paper

The following commercial paper programs were in place at:

       September 30, 2013 December 31, 2012
       Weighted -    Commercial   Weighted - Commercial
       Average     Paper Unused Average  Paper
       Interest Rate Capacity Issuances Capacity Interest Rate Issuances
 PPL Energy Supply   $ 750    $ 750  0.50% $ 356
 PPL Electric     300      300      
 LG&E (a) 0.28%   350 $ 72   278  0.42%   55
 KU (a) 0.28%   350   140   210  0.42%   70
   Total    $ 1,750 $ 212 $ 1,538    $ 481

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

Dividends/distributions paid to and capital contributions received from parent/member

During the nine months ended September 30, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 408  $ 94 $ 116 $ 67 $ 83
Capital contributions received from parent/member   980    205   146   54   92