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Financing Activities (Credit Arrangements) (Details)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing
USD ($)
Sep. 30, 2012
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2012
WPD South West [Member]
Replaced Credit Facility [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2012
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2012
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2012
WPD [Member]
USD ($)
Sep. 30, 2012
WPD [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
GBP (£)
Sep. 30, 2012
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Sep. 30, 2012
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
2014 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply [Member]
2015 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Electric [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
USD ($)
Sep. 30, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Apr. 30, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jul. 31, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Sep. 30, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
KU [Member]
USD ($)
Dec. 31, 2011
KU [Member]
USD ($)
Sep. 30, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
2014 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Energy Supply LLC [Member]
2015 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
USD ($)
Sep. 30, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Apr. 30, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jul. 31, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Sep. 30, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Sep. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
USD ($)
Sep. 30, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2012
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Financing Activities [Line Items]                                                                                                                                            
Expiration date Jan. 24, 2013     Jan. 12, 2017 Jul. 31, 2012 Apr. 16, 2016   Apr. 16, 2016                 Oct. 19, 2016     Mar. 31, 2013   Jun. 30, 2017 Nov. 30, 2016         Oct. 19, 2016     Sep. 23, 2013     Oct. 19, 2016     Oct. 19, 2016 Apr. 29, 2014       Oct. 19, 2016     Mar. 31, 2013   Jun. 30, 2017 Nov. 30, 2016         Oct. 19, 2016     Sep. 23, 2013     Oct. 19, 2016     Oct. 19, 2016 Apr. 29, 2014   Oct. 19, 2016     Oct. 19, 2016 Apr. 29, 2014  
Capacity £ 150     £ 245 [1] £ 210 £ 300   £ 300     £ 1,079   £ 84   $ 3,375   $ 3,000 [2]   $ 175 [3] $ 200       $ 75 $ 100 $ 400   $ 300 [2],[4] $ 200   $ 100 [5] $ 150   $ 400 [2] $ 598   $ 400 [2] $ 198 [6]   $ 3,375   $ 3,000 [2]   $ 175 [3] $ 200       $ 75 $ 100 $ 400   $ 300 [2],[4] $ 200   $ 100 [5] $ 150   $ 400 [2] $ 598   $ 400 [2] $ 198 [6]   $ 400 [2] $ 598   $ 400 [2] $ 198 [6]  
Borrowed 107 [7],[8] 111 [8] 171               107 [7] 111 [8]                                                                                                                    
Letters of credit issued and commercial paper backstop             70   71   4 144 4 3 626 630 468 [2] 541 32 [3] 126 89         1 1 1 [2]   1         198 198   198 [6] 198 626 630 468 [2] 541 32 [3] 126 89         1 1 1 [2]   1         198 198   198 [6] 198   198 198   198 [6] 198
Unused capacity 43     245 [1]   300   300   1,500 [9] 968   80   2,749   2,532 [2]   143 [3] 74           399   299 [2]     100 [5]     400 [2] 400   400 [2]     2,749   2,532 [2]   143 [3] 74           399   299 [2]     100 [5]     400 [2] 400   400 [2]     400 [2] 400   400 [2]    
Interest rate on outstanding borrowing 0.8818%                                                                                                                                          
Minimum interest coverage ratio allowed under the credit facility       3.0 times                                                                                                                                    
Maximum percentage of total net debt to RAV allowed under the credit facility       85.00%                                                                                                                                    
Origination date       Jan. 31, 2012                                       Jul. 27, 2012 Jul. 31, 2012                                               Jul. 27, 2012 Jul. 31, 2012                                        
Accounts receivable pledged under the credit facility                                                             240   251                                             240   251                        
Unbilled revenue pledged under the credit facility                                                             80   98                                             80   98                        
Available capacity under the asset-backed credit facility                                                             100                                                 100                            
Maximum percentage of debt to total capitalization allowed under the credit facility                                               65.00% 65.00%                                               65.00% 65.00%                                        
Potential maximum Facility Agreement capacity                                           500                                                 500                                              
Secured energy marketing and trading facility capacity                                             $ 800                                                 $ 800                                            
[1] In January 2012, WPD (South West) entered into a £245 million 5-year syndicated credit facility to replace the previous £210 million 3-year syndicated credit facility that was set to expire in July 2012. Under the facility, WPD (South West) has the ability to make cash borrowings but cannot request the lenders to issue letters of credit. WPD (South West) pays customary commitment fees under this facility and borrowings bear interest at LIBOR-based rates plus a margin. The credit facility contains financial covenants that require WPD (South West) to maintain an interest coverage ratio of not less than 3.0 times consolidated earnings before income taxes, depreciation and amortization and total net debt not in excess of 85% of its RAV, in each case calculated in accordance with the credit facility.
[2] In November 2012, the syndicated credit facilities were amended to extend the expiration dates to November 2017 for PPL Energy Supply, LG&E and KU and to October 2017 for PPL Electric. In addition, LG&E increased the credit facility capacity to $500 million.
[3] In July 2012, PPL Energy Supply entered into two uncommitted letter of credit facilities with available capacity of $75 million and $100 million, respectively, which expire in July 2014 and July 2015. Both facilities contain a financial covenant requiring PPL Energy Supply’s debt to capitalization not to exceed 65%, as calculated in accordance with the agreements. PPL Energy Supply will pay customary fees for letters of credit issued under these facilities.
[4] In April 2012, PPL Electric increased the capacity of its syndicated credit facility from $200 million.
[5] 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 September 30, 2012 and December 31, 2011, $240 million and $251 million of accounts receivable and $80 million and $98 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 September 30, 2012, 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.                  In July 2012, PPL Electric and the subsidiary reduced the capacity from $150 million and in September 2012 extended the agreement to September 2013.
[6] In August 2012, the KU letter of credit facility agreement was amended and restated to allow for certain payments under the letter of credit facility to be converted to loans rather than requiring immediate payment.
[7] Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.
[8] The amount outstanding at September 30, 2012 was a USD-denominated borrowing of $171 million, which equated to £107 million at the time of borrowing and bore interest at 0.8818%.
[9] At September 30, 2012, the U.S. dollar equivalent of unused capacity under WPD's credit facilities was $1.5 billion.