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Financing Activities (Credit Arrangements) (Details)
 12 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 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, 2013
Syndicated Credit Facility [Member]
Dec. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
PPL WW [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
WPD South West [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2012
WPD South West [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
WPD [Member]
USD ($)
Dec. 31, 2013
WPD [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2012
WPD [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2013
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Dec. 31, 2013
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
USD ($)
Dec. 31, 2012
KU [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
US [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
UK [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2012
UK [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD [Member]
GBP (£)
Dec. 31, 2012
UK [Member]
WPD [Member]
GBP (£)
Dec. 31, 2013
UK [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2012
UK [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2012
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2012
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 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. 12, 2017   Apr. 16, 2016   Apr. 16, 2016               Nov. 06, 2017       Mar. 31, 2014   Jun. 30, 2017 Nov. 03, 2018 Oct. 18, 2017   Oct. 30, 2018 Nov. 06, 2017       Nov. 06, 2017   May 01, 2016   Nov. 12, 2018                       Nov. 06, 2017       Mar. 31, 2014   Jun. 30, 2017 Nov. 03, 2018 Oct. 18, 2017   Oct. 30, 2018 Nov. 06, 2017       Nov. 06, 2017   May 01, 2016   Nov. 06, 2017       Nov. 06, 2017   May 01, 2016  
Capacity                           $ 3,325,000,000   $ 3,000,000,000 [1],[2]   $ 175,000,000 [2]   $ 150,000,000 [2]       $ 300,000,000 [1],[2]   $ 75,000,000 [1],[2] $ 500,000,000 [1],[2]   $ 598,000,000   $ 400,000,000 [1],[2]   $ 198,000,000 [1],[2],[3]   $ 300,000,000 [1],[2] £ 210,000,000 [1],[4]   £ 245,000,000 [1],[4] £ 300,000,000 [1],[4],[5] £ 300,000,000 [1],[4],[5] £ 1,139,000,000 [6]   £ 84,000,000   $ 3,325,000,000   $ 3,000,000,000 [1],[2]   $ 175,000,000 [2]   $ 150,000,000 [2]       $ 300,000,000 [1],[2]   $ 75,000,000 [1],[2] $ 500,000,000 [1],[2]   $ 598,000,000   $ 400,000,000 [1],[2]   $ 198,000,000 [1],[2],[3]   $ 500,000,000 [1],[2]   $ 598,000,000   $ 400,000,000 [1],[2]   $ 198,000,000 [1],[2],[3]  
Borrowed                     166,000,000 171,000,000                              75,000,000 [1],[2],[7]                     270,000,000 [1],[2],[7] 103,000,000 [1],[4] 106,000,000 [1],[4]          103,000,000 [6] 106,000,000 [6]                                 75,000,000 [1],[2],[7]                                        
Letters of credit issued and commercial paper backstop                           244,000,000 671,000,000 29,000,000 [1],[2] 499,000,000 [1],[2] 77,000,000 [2] 40,000,000 [2] 138,000,000 [2] 132,000,000 [2]     21,000,000 [1],[2] 1,000,000 [1],[2]    20,000,000 [1],[2] 55,000,000 [1],[2] 348,000,000 268,000,000 150,000,000 [1],[2] 70,000,000 [1],[2] 198,000,000 [1],[2],[3] 198,000,000 [1],[2],[3]              5,000,000 [6] 4,000,000 [6] 5,000,000 4,000,000 244,000,000 671,000,000 29,000,000 [1],[2] 499,000,000 [1],[2] 77,000,000 [2] 40,000,000 [2] 138,000,000 [2] 132,000,000 [2]     21,000,000 [1],[2] 1,000,000 [1],[2]    20,000,000 [1],[2] 55,000,000 [1],[2] 348,000,000 268,000,000 150,000,000 [1],[2] 70,000,000 [1],[2] 198,000,000 [1],[2],[3] 198,000,000 [1],[2],[3] 20,000,000 [1],[2] 55,000,000 [1],[2] 348,000,000 268,000,000 150,000,000 [1],[2] 70,000,000 [1],[2] 198,000,000 [1],[2],[3] 198,000,000 [1],[2],[3]
Unused capacity                   1,700,000,000       3,081,000,000   2,971,000,000 [1],[2]   98,000,000 [2]   12,000,000 [2]       279,000,000 [1],[2]      480,000,000 [1],[2]   250,000,000   250,000,000 [1],[2]        30,000,000 [1],[2] 107,000,000 [1],[4]   245,000,000 [1],[4] 300,000,000 [1],[4],[5] 300,000,000 [1],[4],[5] 1,031,000,000 [6]   79,000,000   3,081,000,000   2,971,000,000 [1],[2]   98,000,000 [2]   12,000,000 [2]       279,000,000 [1],[2]      480,000,000 [1],[2]   250,000,000   250,000,000 [1],[2]        480,000,000 [1],[2]   250,000,000   250,000,000 [1],[2]       
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                     1.87% 0.85% 1.79%                         1.67%                                                             1.67%                                
Maximum percentage of debt to total capitalization allowed under the credit facility 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%                         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% 70.00%
Potential capacity increase                               500,000,000               100,000,000   25,000,000         100,000,000                               500,000,000               100,000,000   25,000,000 100,000,000       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                                      
[1] Each company pays customary fees under its respective facility and borrowings generally bear interest at LIBOR-based rates plus an applicable margin.
[2] The facilities contain a financial covenant requiring debt to total capitalization not to exceed 65% for PPL Energy Supply and 70% for PPL, PPL Electric, LKE, 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, PPL Electric and KU each may request up to a $100 million increase in its facility's capacity and LKE may request up to a $25 million increase in its facility's capacity.
[3] 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.
[4] The facilities contain financial covenants 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.
[5] 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.
[6] PPL WW's amounts borrowed at December 31, 2013 and 2012 were USD-denominated borrowings of $166 million and $171 million, which equated to £103 million and £106 million at the time of the borrowings and bore interest at 1.87% and 0.85%. At December 31, 2013, the unused capacity of WPD's credit facilities was approximately $1.7 billion.
[7] PPL Capital Funding's and LKE's borrowings at December 31, 2013 bore interest at 1.79% and 1.67%, respectively.