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Financing Activities (Credit Arrangements) (Details)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
PPL WW [Member]
New Facility Subsequent To Period End [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD South West [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2011
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
WPD [Member]
USD ($)
Dec. 31, 2012
WPD [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
GBP (£)
Dec. 31, 2012
WPD [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2011
WPD [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2012
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2011
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2012
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2010
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Oct. 31, 2010
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
Dec. 31, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Feb. 28, 2013
PPL Energy Supply [Member]
Subsequent To Period End Activity [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
LGE [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
KU [Member]
USD ($)
Dec. 31, 2011
KU [Member]
USD ($)
Dec. 31, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
KU [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
USD ($)
Oct. 31, 2010
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2010
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Feb. 28, 2013
PPL Energy Supply LLC [Member]
Subsequent To Period End Activity [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2011
PPL Electric Utilities Corp [Member]
Asset Backed Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2011
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Financing Activities [Line Items]                                                                                                                                                            
Expiration date Jan. 24, 2013   Dec. 01, 2016 Jan. 12, 2017   Apr. 16, 2016   Apr. 16, 2016                     Nov. 06, 2017           Mar. 31, 2013   Jun. 30, 2017 Nov. 03, 2017       Oct. 18, 2017   Sep. 23, 2013   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014         Nov. 06, 2017         Mar. 31, 2013   Jun. 30, 2017 Nov. 03, 2017       Oct. 18, 2017   Sep. 23, 2013   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014   Nov. 06, 2017       Nov. 06, 2017   Apr. 29, 2014  
Capacity £ 150,000,000 [1],[2],[3]   £ 210,000,000 £ 245,000,000 [1],[3]   £ 300,000,000 [1],[3]   £ 300,000,000 [1],[3],[4]     £ 1,079,000,000 [5]       £ 84,000,000   $ 3,400,000,000   $ 3,000,000,000 [1],[6],[7]       $ 200,000,000 [6]   $ 200,000,000 [8]       $ 150,000,000 $ 400,000,000   $ 300,000,000 [1],[6]   $ 100,000,000 [9]   $ 500,000,000 [1],[6]   $ 598,000,000   $ 400,000,000 [1],[6]   $ 198,000,000 [1],[10],[6]   $ 3,400,000,000     $ 3,000,000,000 [1],[6],[7]     $ 200,000,000 [6]   $ 200,000,000 [8]       $ 150,000,000 $ 400,000,000   $ 300,000,000 [1],[6]   $ 100,000,000 [9]   $ 500,000,000 [1],[6]   $ 598,000,000   $ 400,000,000 [1],[6]   $ 198,000,000 [1],[10],[6]   $ 500,000,000 [1],[6]   $ 598,000,000   $ 400,000,000 [1],[6]   $ 198,000,000 [1],[10],[6]  
Borrowed 106,000,000 [1],[11],[2],[3] 111,000,000 [1],[11],[2],[3]                    106,000,000 [11],[5] 111,000,000 [11],[5] 171,000,000 178,000,000                  3,200,000,000                                                       3,200,000,000                                                                            
Letters of credit issued and commercial paper backstop             70,000,000 [1],[3],[4]   71,000,000 [1],[3],[4]   4,000,000 [5] 144,000,000 [5]     4,000,000 3,000,000 671,000,000 630,000,000 499,000,000 [1],[6],[7]   541,000,000 [1],[6],[7]   40,000,000 [6]   132,000,000 89,000,000       1,000,000 1,000,000 1,000,000 [1],[6] 1,000,000 [1],[6]     55,000,000 [1],[6]   268,000,000 198,000,000 70,000,000 [1],[6]   198,000,000 [1],[10],[6] 198,000,000 [1],[10],[6] 671,000,000 630,000,000   499,000,000 [1],[6],[7]   541,000,000 [1],[6],[7] 40,000,000 [6]   132,000,000 89,000,000       1,000,000 1,000,000 1,000,000 [1],[6] 1,000,000 [1],[6]     55,000,000 [1],[6]   268,000,000 198,000,000 70,000,000 [1],[6]   198,000,000 [1],[10],[6] 198,000,000 [1],[10],[6] 55,000,000 [1],[6]   268,000,000 198,000,000 70,000,000 [1],[6]   198,000,000 [1],[10],[6] 198,000,000 [1],[10],[6]
Unused capacity 44,000,000 [1],[2],[3]     245,000,000 [1],[3],[4]   300,000,000 [1],[3],[4]   300,000,000 [1],[3],[4]   1,600,000,000 [5] 969,000,000       80,000,000   2,729,000,000   2,501,000,000 [1],[6],[7]       160,000,000 [6]   68,000,000         399,000,000   299,000,000 [1],[6]   100,000,000 [9]   445,000,000 [1],[6]   330,000,000   330,000,000 [1],[6]        2,729,000,000     2,501,000,000 [1],[6],[7]     160,000,000 [6]   68,000,000         399,000,000   299,000,000 [1],[6]   100,000,000 [9]   445,000,000 [1],[6]   330,000,000   330,000,000 [1],[6]        445,000,000 [1],[6]   330,000,000   330,000,000 [1],[6]       
Minimum interest coverage ratio allowed under the credit facility 3.0 times 3.0 times   3.0 times 3.0 times 3.0 times 3.0 times 3.0 times 3.0 times                                                                                                                                          
Maximum percentage of total net debt to RAV allowed under the credit facility 85.00% 85.00%   85.00% 85.00% 85.00% 85.00% 85.00% 85.00%                                                                                                                                          
Maximum amount of letters of credit that may be issued under credit facility           80,000,000   80,000,000                                                                                                                                            
Interest rate on outstanding borrowing                         0.8452% 1.05%               2.26%                                               2.26%                                                                
Deferred fees                                       41,000,000                                                   41,000,000                                                                
The original capacity of the facility, prior to the reduction                                       4,000,000,000                                                       4,000,000,000                                                            
Deferred fees, written-off, in connection with the reduction in credit facility capacity                                       10,000,000                                                       10,000,000                                                            
Deferred fees, after-tax, written-off, in connection with the reduction in credit facility capacity                                       6,000,000                                                       6,000,000                                                            
Maximum percentage of debt to total capitalization allowed under the credit facility                                     65.00%   65.00%   65.00% 65.00%               70.00% 70.00%     70.00% 70.00%     70.00% 70.00% 70.00% 70.00%       65.00%   65.00% 65.00% 65.00%               70.00% 70.00%     70.00% 70.00%     70.00% 70.00% 70.00% 70.00% 70.00% 70.00%     70.00% 70.00% 70.00% 70.00%
Potential capacity increase                                     500,000,000                         100,000,000       100,000,000       100,000,000             500,000,000                       100,000,000       100,000,000       100,000,000       100,000,000       100,000,000      
Accounts receivable pledged under the credit facility                                                                   238,000,000 251,000,000                                                   238,000,000 251,000,000                                
Unbilled revenue pledged under the credit facility                                                                   106,000,000 98,000,000                                                   106,000,000 98,000,000                                
Available capacity under the asset-backed credit facility                                                                   100,000,000                                                     100,000,000                                  
Potential maximum Facility Agreement capacity                                                     500,000,000                                                     500,000,000                                                
Secured energy marketing and trading facility capacity                                                       800,000,000                                                     800,000,000                                              
Aggregate carrying value of mortgages                                                       $ 2,700,000,000                                                     $ 2,700,000,000                                              
Automatic renewal term (in years)                                                       1                                                     1                                              
Effective date                                                         2014-03-30                                                     2014-03-30                                            
[1] Each company pays customary fees under its respective facility and borrowings generally bear interest at LIBOR-based rates plus an applicable margin.
[2] In December 2012, the PPL WW credit facility was subsequently replaced with a credit facility expiring in December 2016 and the capacity was increased to £210 million.
[3] The facilities contain financial covenants that require the company 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, calculated in accordance with the credit facility.
[4] Under these facilities, WPD (East Midlands) and WPD (West Midlands) each have the ability to request the lenders to issue up to £80 million of letters of credit in lieu of borrowing.
[5] The total amounts borrowed at December 31, 2012 and 2011 were USD-denominated borrowings of $171 million and $178 million, which equated to £106 million and £111 million at the time of the borrowings. The interest rates at December 31, 2012 and 2011 were 0.8452% and 1.05%. At December 31, 2012, the unused capacity of WPD's credit facilities was approximately $1.6 billion.
[6] The facilities contain a financial covenant requiring debt to total capitalization not to exceed 65% for PPL Energy Supply and 70% for PPL Electric, LG&E and KU, as calculated in accordance with the facilities and other customary covenants. Additionally, as it relates to the syndicated credit facilities and subject to certain conditions, PPL Energy Supply may request that its facility's capacity be increased by up to $500 million and PPL Electric and KU each may request up to a $100 million increase in its facility's' capacity.
[7] In October 2010, PPL Energy Supply borrowed $3.2 billion under this facility in order to enable a subsidiary to make loans to certain affiliates to provide interim financing of amounts required by PPL to partially fund PPL's acquisition of LKE. Such borrowing bore interest at 2.26% and was refinanced primarily through the issuance of long-term debt by LKE, LG&E and KU and the use of internal funds. This borrowing and related payments were included in "Net increase (decrease) in short-term debt" on the Statement of Cash Flows. PPL Energy Supply incurred an aggregate of $41 million of fees in 2010 in connection with establishing this facility. Such fees were initially deferred and amortized through December 2014. In connection with the reduction in the capacity from $4 billion to $3 billion in December 2010, PPL Energy Supply wrote off $10 million, $6 million after tax, of deferred fees, which was reflected in "Interest Expense" in the Statement of Income.
[8] In February 2013, PPL Energy Supply extended the expiration date of the agreement to March 2014 and, effective April 2013, the capacity will be reduced to $150 million.
[9] 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 December 31, 2012 and December 31, 2011, $238 million and $251 million of accounts receivable and $106 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 December 31, 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.
[10] KU's letter of credit facility agreement allows for certain payments under the letter of credit facility to be converted to loans rather than requiring immediate payment.
[11] Amounts borrowed are recorded as "Short-term debt" on the Balance Sheets.