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Financing Activities (Credit Arrangements) (Details)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2013
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2013
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2013
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2013
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2013
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2013
WPD [Member]
USD ($)
Jun. 30, 2013
WPD [Member]
GBP (£)
Dec. 31, 2012
WPD [Member]
GBP (£)
Jun. 30, 2013
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2012
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Jun. 30, 2013
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Feb. 28, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
Jun. 30, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Apr. 30, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jun. 30, 2013
PPL Electric [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
USD ($)
Jun. 30, 2013
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2013
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
KU [Member]
USD ($)
Dec. 31, 2012
KU [Member]
USD ($)
Jun. 30, 2013
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
May 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
Jun. 30, 2013
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Feb. 28, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Apr. 30, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2013
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jun. 30, 2013
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
USD ($)
Jun. 30, 2013
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
May 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
Jun. 30, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2013
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2013
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
Jun. 30, 2013
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
May 31, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
Jun. 30, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Financing Activities [Line Items]                                                                                                                                                          
Expiration date Dec. 21, 2016 Jan. 24, 2013     Jan. 12, 2017 Apr. 16, 2016   Apr. 16, 2016                 Nov. 06, 2017       Mar. 31, 2013 Mar. 31, 2014     Jun. 30, 2017 Nov. 30, 2017     Oct. 18, 2017   Sep. 23, 2013   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014 May 01, 2016 [1]       Nov. 06, 2017       Mar. 31, 2013 Mar. 31, 2014     Jun. 30, 2017 Nov. 30, 2017     Oct. 18, 2017   Sep. 23, 2013   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014 May 01, 2016 [1]   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014 May 01, 2016 [1]  
Capacity £ 210 [2] £ 150     £ 245 £ 300   £ 300     £ 1,139   £ 84   $ 3,350   $ 3,000   $ 200     $ 150 [3] $ 200       $ 400   $ 300   $ 100 [4]   $ 500   $ 598   $ 400     $ 198   $ 3,350   $ 3,000   $ 200     $ 150 [3] $ 200       $ 400   $ 300   $ 100 [4]   $ 500   $ 598   $ 400     $ 198   $ 500   $ 598   $ 400     $ 198  
Borrowed 112 [5],[6] 106 [5],[6] 171 171   47 [5],[6] 71 34 [5],[6] 52   193 [5] 106 [5]                                                                                                                                  
Letters of credit issued and commercial paper backstop                     5 4 5 4 865 671 637 499 80 40   148   132     86 1 86 1     80 55 370 268 172 70   198 198 865 671 637 499 80 40   148   132     86 1 86 1     80 55 370 268 172 70   198 198 80 55 370 268 172 70   198 198
Unused capacity 98       245 253   266   1,400 [7] 941   79   2,485   2,363   120     2         314   214   100   420   228   228         2,485   2,363   120     2         314   214   100   420   228   228         420   228   228        
Interest rate on outstanding borrowing 1.90% 0.85%       1.30%   1.30%                                                                                                                                          
Accounts receivable pledged under the credit facility                                                             272 238                                                   272 238                                    
Unbilled revenue pledged under the credit facility                                                             74 106                                                   74 106                                    
Available capacity under the asset-backed credit facility                                                             100                                                     100                                      
Potential maximum Facility Agreement capacity                                                 500                                                     500                                                  
Secured energy marketing and trading facility capacity                                                   $ 800                                                     $ 800                                                
Automatic renewal term (in years)                                                   1                                                     1                                                
[1] In May 2013, KU extended the letter of credit facility from April 2014.
[2] 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.
[3] In February 2013, PPL Energy Supply extended the expiration date from March 2013 and, effective April 2013, the capacity was reduced from $200 million.
[4] 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 June 30, 2013 and December 31, 2012, $272 million and $238 million of accounts receivable and $74 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 June 30, 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.
[5] Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.
[6] PPL WW's amounts borrowed at June 30, 2013 and December 31, 2012 were USD-denominated borrowings of $171 million, which equated to £112 million and £106 million at the time of borrowings and bore interest at 1.90% and 0.85%. WPD (East Midlands) amount borrowed at June 30, 2013 was a GBP-denominated borrowing of £47 million, which equated to $71 million and bore interest at 1.30%. WPD (West Midlands) amount borrowed at June 30, 2013 was a GBP-denominated borrowing of £34 million, which equated to $52 million and bore interest at 1.30%.
[7] At June 30, 2013, the USD equivalent of unused capacity under WPD's credit facilities was $1.4 billion.