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Financing Activities (Credit Arrangements) (Details)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 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 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2012
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2012
WPD South West [Member]
Replaced Credit Facility [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2012
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2012
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2012
WPD [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
GBP (£)
Jun. 30, 2012
WPD [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2012
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Jun. 30, 2012
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jul. 31, 2012
PPL Energy Supply [Member]
New Facility Subsequent To Period End [Member]
2014 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Jul. 31, 2012
PPL Energy Supply [Member]
New Facility Subsequent To Period End [Member]
2015 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Electric [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
USD ($)
Jun. 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 ($)
Jul. 31, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
KU [Member]
USD ($)
Dec. 31, 2011
KU [Member]
USD ($)
Jun. 30, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2012
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jul. 31, 2012
PPL Energy Supply LLC [Member]
New Facility Subsequent To Period End [Member]
2014 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Jul. 31, 2012
PPL Energy Supply LLC [Member]
New Facility Subsequent To Period End [Member]
2015 Uncommitted Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
USD ($)
Jun. 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 ($)
Jul. 31, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Jun. 30, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Jun. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
USD ($)
Jun. 30, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2012
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Credit Facility [Line Items]                                                                                                                                        
Expiration date January 2013     January 2017 July 2012 April 2016   April 2016                 October 2016   March 2013   June 2017 November 2016 July 2014 July 2015     October 2016     September 2012 July 2012   October 2016     October 2016 April 2014       October 2016   March 2013   June 2017 November 2016 July 2014 July 2015     October 2016     September 2012 July 2012   October 2016     October 2016 April 2014   October 2016     October 2016 April 2014  
Capacity £ 150     £ 245 [1] £ 210 £ 300   £ 300   £ 1,079     £ 84   $ 3,200   $ 3,000   $ 200       $ 75 $ 100 $ 450   $ 300 [2] $ 200   $ 100 $ 150 [3]   $ 400 $ 598   $ 400 $ 198   $ 3,200   $ 3,000   $ 200       $ 75 $ 100 $ 450   $ 300 [2] $ 200   $ 100 $ 150 [3]   $ 400 $ 598   $ 400 $ 198   $ 400 $ 598   $ 400 $ 198  
Borrowed 110 [4],[5] 111 [4] 174             110 [4] 111 [4]                                                                                                                  
Letters of credit issued and commercial paper backstop             70   71 4 144   4 3 790 630 662 541 128 89         196 1 196   1         198 198   198 198 790 630 662 541 128 89         196 1 196   1         198 198   198 198   198 198   198 198
Unused capacity 40     245 [1]   300   300   965 [6]   1,500 80   2,410   2,338   72           254   104       150 [3]   400 400   400     2,410   2,338   72           254   104       150 [3]   400 400   400     400 400   400    
Interest rate on outstanding borrowing 1.458%                                                                                                                                      
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                                             July 2012 July 2012                                             July 2012 July 2012                                        
Accounts receivable pledged under the credit facility                                                             237 251                                             237 251                        
Unbilled revenue pledged under the credit facility                                                             87 98                                             87 98                        
Available capacity under the asset-backed credit facility                                                             87                                               87                          
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                                            
Automatic renewal term (in years)                                           1                                               1                                            
[1] In January 2012, WPD (South West) entered into a new £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 April 2012, PPL Electric increased the capacity of its syndicated credit facility from $200 million.
[3] 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, 2012 and December 31, 2011, $237 million and $251 million of accounts receivable and $87 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 June 30, 2012, the amount available for borrowing under the facility was limited to $87 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 extended this agreement to September 2012 and reduced the capacity to $100 million.
[4] Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.
[5] The borrowing outstanding at June 30, 2012 was a USD-denominated borrowing of $174 million, which equated to £110 million at the time of borrowing and bore interest at approximately 1.458%.
[6] At June 30, 2012, the U.S. dollar equivalent of unused capacity under WPD's credit facilities was approximately $1.5 billion.