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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
Sep. 30, 2014
Syndicated Credit Facility [Member]
Sep. 30, 2014
Syndicated Credit Facility [Member]
Sep. 30, 2014
Bilateral Credit Facility [Member]
Sep. 30, 2014
PPL WW [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
WPD South West [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
WPD [Member]
USD ($)
Dec. 31, 2013
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Sep. 30, 2014
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LKE [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
KU [Member]
USD ($)
Dec. 31, 2013
KU [Member]
USD ($)
Sep. 30, 2014
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2014
United Kingdom, Pounds [Member]
GBP (£)
Dec. 31, 2013
United Kingdom, Pounds [Member]
GBP (£)
Sep. 30, 2014
United Kingdom, Pounds [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
United Kingdom, Pounds [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2014
United Kingdom, Pounds [Member]
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2014
United Kingdom, Pounds [Member]
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2014
United Kingdom, Pounds [Member]
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Sep. 30, 2014
United Kingdom, Pounds [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2013
United Kingdom, Pounds [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Sep. 30, 2014
United States of America, Dollars [Member]
PPL Capital Funding [Member]
USD ($)
Dec. 31, 2013
United States of America, Dollars [Member]
PPL Capital Funding [Member]
USD ($)
Sep. 30, 2014
United States of America, Dollars [Member]
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
United States of America, Dollars [Member]
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
United States of America, Dollars [Member]
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
United States of America, Dollars [Member]
PPL Capital Funding [Member]
Bilateral Credit Facility [Member]
USD ($)
Sep. 30, 2014
United States of America, Dollars [Member]
PPL Capital Funding [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Sep. 30, 2014
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Sep. 30, 2014
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
Syndicated Credit Facility [Member]
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Sep. 30, 2014
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
Sep. 30, 2014
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Financing Activities [Line Items]                                                                                                                                                                
Expiration date Jul. 28, 2019 Nov. 12, 2018 Mar. 26, 2015 Dec. 21, 2016   Jul. 29, 2019 Jul. 29, 2019 Jul. 29, 2019         Nov. 06, 2017       Mar. 19, 2015   Jun. 30, 2017 Nov. 03, 2018 Jul. 28, 2019       Oct. 31, 2018 Jul. 29, 2019       Jul. 29, 2019   May 01, 2016                                       Nov. 06, 2017       Mar. 19, 2015   Jun. 30, 2017 Nov. 03, 2018 Jul. 28, 2019       Oct. 31, 2018 Jul. 29, 2019       Jul. 29, 2019   May 01, 2016   Jul. 29, 2019       Jul. 29, 2019   May 01, 2016  
Capacity                     $ 3,325   $ 3,000 [1]   $ 175   $ 150       $ 300   $ 75 [1]     $ 500   $ 598   $ 400   $ 198 [2]   £ 1,160 [3]   £ 210   £ 245 £ 300 £ 300 £ 105   $ 815   $ 300 $ 300 [1]   $ 150 $ 65 $ 3,325   $ 3,000 [1]   $ 175   $ 150       $ 300   $ 75 [1]     $ 500   $ 598   $ 400   $ 198   $ 500   $ 598   $ 400   $ 198 [2]  
Borrowed                     590   590 [1]                   75 [1] 75 [1]                   97 [3] 103 [3] 97 103             270     270     590   590 [1]                   75 [1] 75 [1]                                  
Letters of credit and commercial paper issued                     269 244 82 [1] 29 [1] 74 77 113 138     1 21       143 20 328 348 130 150 198 [2] 198 [2] 5 [3] 5 [3]           5 5               269 244 82 [1] 29 [1] 74 77 113 138     1 21       143 20 328 348 130 150 198 198 143 20 328 348 130 150 198 [2] 198 [2]
Unused capacity                 1,800   2,466   2,328 [1]   101   37       299         357   270   270       1,058 [3]   113   245 300 300 100   815   300 300 [1]   150 65 2,466   2,328 [1]   101   37       299         357   270   270       357   270   270      
Interest rate on outstanding borrowing       1.86% 1.87%         1.79%     2.04%                   1.66% 1.67%                                                       2.04%                   1.66% 1.67%                                  
Potential maximum Facility Agreement capacity                                     500                                                                             500                                            
Secured energy marketing and trading facility capacity                                       800                                                                             800                                          
Automatic renewal term (in years)                                       1                                                                             1                                          
Secured obligations outstanding                                       $ 59                                                                             $ 59                                          
[1]

At September 30, 2014, interest rates on outstanding borrowings were 2.04% for PPL Energy Supply and 1.66% for LKE. At December 31, 2013, interest rates on outstanding borrowings were 1.79% for PPL Capital Funding and 1.67% for LKE.

[2]

In October 2014, the KU letter of credit facility was terminated and replaced with a new letter of credit facility with the same capacity expiring October 2017.

[3]

PPL WW's amounts borrowed at September 30, 2014 and December 31, 2013 were USD-denominated borrowings of $161 million and $166 million, which bore interest at 1.86% and 1.87%. At September 30, 2014, the unused capacity under the U.K. credit facilities was $1.8 billion.