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Financing Activities (Tables)
3 Months Ended
Mar. 31, 2013
Financing Activities [Line Items]  
Credit Facilities in Place at Period End

The following credit facilities were in place at:

       March 31, 2013 December 31, 2012
                Letters of      Letters of
                Credit Issued       Credit Issued
                and       and
                Commercial       Commercial
       Expiration    Borrowed Paper Unused Borrowed Paper
        Date Capacity (a) Backup Capacity (a) Backup
PPL                     
 WPD Credit Facilities                    
  PPL WW Syndicated                    
   Credit Facility (b) (c) Dec. 2016 £ 210 £ 109  n/a £ 101 £ 106  n/a
  WPD (South West)                     
   Syndicated Credit Facility  Jan. 2017   245     n/a   245     n/a
  WPD (East Midlands)                     
   Syndicated Credit Facility (c) Apr. 2016   300   65      235      
  WPD (West Midlands)                    
   Syndicated Credit Facility  Apr. 2016   300         300      
  Uncommitted Credit Facilities     84    £ 4   80    £ 4
   Total WPD Credit Facilities (d)   £ 1,139 £ 174 £ 4 £ 961 £ 106 £ 4
                           
PPL Energy Supply                     
 Syndicated Credit Facility  Nov. 2017 $ 3,000    $ 641 $ 2,359    $ 499
 Letter of Credit Facility (e) Mar. 2014   200  n/a   123   77  n/a   132
 Uncommitted Credit Facilities      200  n/a   88   112  n/a   40
   Total PPL Energy Supply Credit Facilities $ 3,400    $ 852 $ 2,548    $ 671
                           
PPL Electric                     
 Syndicated Credit Facility  Oct. 2017 $ 300    $ 126 $ 174    $ 1
 Asset-backed Credit Facility (f) Sept. 2013   100     n/a   100     n/a
   Total PPL Electric Credit Facilities   $ 400    $ 126 $ 274    $ 1
                           
LG&E                     
 Syndicated Credit Facility  Nov. 2017 $ 500    $ 70 $ 430    $ 55
                           
KU                     
 Syndicated Credit Facility  Nov. 2017 $ 400    $ 115 $ 285    $ 70
 Letter of Credit Facility (g) Apr. 2014   198      198         198
   Total KU Credit Facilities   $ 598    $ 313 $ 285    $ 268

(a)       Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.

(b)       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.

(c)       PPL WW's amounts borrowed at March 31, 2013 and December 31, 2012 were USD-denominated borrowings of $171 million, which equated to £109 million and £106 million at the time of borrowings and bore interest at 1.9034% and 0.8452%. WPD (East Midlands) amount borrowed at March 31, 2013 was a GBP-denominated borrowing of £65 million, which equated to $99 million and bore interest at 1.30%.

(d)       At March 31, 2013, the USD equivalent of unused capacity under WPD's credit facilities was $1.5 billion.

(e)       In February 2013, PPL Energy Supply extended the expiration date from March 2013 and, effective April 2013, the capacity was reduced to $150 million.

(f)       PPL Electric participates in an asset-backed commercial paper program through which PPL Electric obtains financing by selling and contributing its eligible accounts receivable and unbilled revenue to a special purpose, wholly owned subsidiary on an ongoing basis. The subsidiary has pledged these assets to secure loans from a commercial paper conduit sponsored by a financial institution.

 

       At March 31, 2013 and December 31, 2012, $277 million and $238 million of accounts receivable and $98 million and $106 million of unbilled revenue were pledged by the subsidiary under the credit agreement related to PPL Electric's and the subsidiary's participation in the asset-backed commercial paper program. Based on the accounts receivable and unbilled revenue pledged at March 31, 2013, the amount available for borrowing under the facility was $100 million. PPL Electric's sale to its subsidiary of the accounts receivable and unbilled revenue is an absolute sale of assets, and PPL Electric does not retain an interest in these assets. However, for financial reporting purposes, the subsidiary's financial results are consolidated in PPL Electric's financial statements. PPL Electric performs certain record-keeping and cash collection functions with respect to the assets in return for a servicing fee from the subsidiary.

(g)       In May 2013, KU extended the letter of credit facility to May 2016.

PPL Energy Supply LLC [Member]
 
Financing Activities [Line Items]  
Dividends/distributions paid to and capital contributions received from parent/member

During the three months ended March 31, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 313  $ 25 $ 4 $ 19 $ 13
Capital contributions received from parent/member       60   75   25   50
PPL Electric Utilities Corp [Member]
 
Financing Activities [Line Items]  
Dividends/distributions paid to and capital contributions received from parent/member

During the three months ended March 31, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 313  $ 25 $ 4 $ 19 $ 13
Capital contributions received from parent/member       60   75   25   50
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 three months ended March 31, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 313  $ 25 $ 4 $ 19 $ 13
Capital contributions received from parent/member       60   75   25   50
Louisville Gas And Electric Co [Member]
 
Financing Activities [Line Items]  
Dividends/distributions paid to and capital contributions received from parent/member

During the three months ended March 31, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 313  $ 25 $ 4 $ 19 $ 13
Capital contributions received from parent/member       60   75   25   50
Kentucky Utilities Co [Member]
 
Financing Activities [Line Items]  
Dividends/distributions paid to and capital contributions received from parent/member

During the three months ended March 31, 2013, the following distributions and capital contributions occurred:

    PPL Energy             
    Supply  PPL Electric LKE LG&E KU
                   
Dividends/distributions paid to parent/member $ 313  $ 25 $ 4 $ 19 $ 13
Capital contributions received from parent/member       60   75   25   50