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Financing Activities (Credit Arrangements) (Details)
In Millions, unless otherwise specified
 1 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 1 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 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 1 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended
Jul. 31, 2014
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
PPL WW [Member]
Syndicated Credit Facility [Member]
Dec. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Dec. 31, 2013
PPL WW [Member]
Syndicated Credit Facility [Member]
USD Denominated Borrowing [Member]
USD ($)
Jun. 30, 2014
WPD South West [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
WPD [Member]
USD ($)
Dec. 31, 2013
PPL Capital Funding [Member]
Syndicated Credit Facility [Member]
Jul. 31, 2014
PPL Capital Funding [Member]
New Facility Subsequent To Period End [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jul. 31, 2014
PPL Energy Supply [Member]
Subsequent To Period End Activity [Member]
Uncommitted Credit Facilities [Member]
Jun. 30, 2014
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Electric [Member]
Syndicated Credit Facility [Member]
USD ($)
Jul. 31, 2014
PPL Electric [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LKE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
KU [Member]
USD ($)
Dec. 31, 2013
KU [Member]
USD ($)
Jun. 30, 2014
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2014
United States [Member]
USD ($)
Dec. 31, 2013
United States [Member]
USD ($)
Jun. 30, 2014
United States [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
United States [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
United States [Member]
Bilateral Credit Facility [Member]
USD ($)
Jun. 30, 2014
United Kingdom [Member]
GBP (£)
Dec. 31, 2013
United Kingdom [Member]
GBP (£)
Jun. 30, 2014
United Kingdom [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Dec. 31, 2013
United Kingdom [Member]
PPL WW [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jun. 30, 2014
United Kingdom [Member]
WPD South West [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jul. 31, 2014
United Kingdom [Member]
WPD South West [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
United Kingdom [Member]
WPD East Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jul. 31, 2014
United Kingdom [Member]
WPD East Midlands [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
United Kingdom [Member]
WPD West Midlands [Member]
Syndicated Credit Facility [Member]
GBP (£)
Jul. 31, 2014
United Kingdom [Member]
WPD West Midlands [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
United Kingdom [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Dec. 31, 2013
United Kingdom [Member]
WPD [Member]
Uncommitted Credit Facilities [Member]
GBP (£)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Uncommitted Credit Facilities [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Energy Supply LLC [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Facility Agreement [Member]
USD ($)
Jun. 30, 2014
PPL Energy Supply LLC [Member]
Secured Trading Facility [Member]
USD ($)
Integer
Jul. 31, 2014
PPL Energy Supply LLC [Member]
Subsequent To Period End Activity [Member]
Uncommitted Credit Facilities [Member]
Jun. 30, 2014
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
PPL Electric Utilities Corp [Member]
Syndicated Credit Facility [Member]
USD ($)
Jul. 31, 2014
PPL Electric Utilities Corp [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
Syndicated Credit Facility [Member]
USD ($)
Jul. 31, 2014
LG And E And KU Energy LLC [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
LGE [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
USD ($)
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
LG And E And KU Energy LLC [Member]
KU [Member]
Letter Of Credit Facility [Member]
USD ($)
Jun. 30, 2014
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
Louisville Gas And Electric Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Jul. 31, 2014
Louisville Gas And Electric Co [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Jun. 30, 2014
Kentucky Utilities Co [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
USD ($)
Jun. 30, 2014
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Syndicated Credit Facility [Member]
USD ($)
Jun. 30, 2014
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Dec. 31, 2013
Kentucky Utilities Co [Member]
Letter Of Credit Facility [Member]
USD ($)
Jul. 31, 2014
Kentucky Utilities Co [Member]
Subsequent To Period End Activity [Member]
Syndicated Credit Facility [Member]
Financing Activities [Line Items]                                                                                                                                                                              
Expiration date Jul. 18, 2019 Dec. 21, 2016       Jan. 12, 2017 Apr. 16, 2016 Apr. 16, 2016           Nov. 06, 2017       Mar. 19, 2015   Jun. 30, 2017 Nov. 03, 2018 Jul. 31, 2015 Oct. 18, 2017   Oct. 30, 2018 Oct. 31, 2018   Nov. 06, 2017       Nov. 06, 2017   May 01, 2016       Nov. 12, 2018   Mar. 26, 2015           Jul. 18, 2019   Jul. 18, 2019   Jul. 18, 2019         Nov. 06, 2017       Mar. 19, 2015   Jun. 30, 2017 Nov. 03, 2018 Jul. 31, 2015 Oct. 18, 2017   Oct. 30, 2018 Oct. 31, 2018   Jul. 18, 2019 Nov. 06, 2017       Nov. 06, 2017   May 01, 2016   Nov. 06, 2017   Jul. 18, 2019     Nov. 06, 2017   May 01, 2016   Jul. 18, 2019
Capacity                     $ 300 $ 3,325   $ 3,000 [1]   $ 175 [2]   $ 150         $ 300 [2]     $ 75 [1]   $ 500 [2]   $ 598   $ 400 [2]   $ 198   $ 450   $ 300 [1]   $ 150 £ 1,160 [3]   £ 210   £ 245 [2]   £ 300 [2]   £ 300 [2]   £ 105   $ 3,325   $ 3,000 [1]   $ 175 [2]   $ 150         $ 300 [2]     $ 75 [1]     $ 500 [2]   $ 598   $ 400 [2]   $ 198   $ 500 [2]     $ 598   $ 400 [2]   $ 198    
Borrowed       164 166             175   175 [1]                       75 [1] 75 [1]                   270   270 [1]   97 [3] 103 [3] 97 103                 175   175 [1]                       75 [1] 75 [1]                                      
Letters of credit and commercial paper issued                       484 244 264 [1] 29 [1] 77 [2] 77 [2] 143 138       1 [2] 21 [2]       70 [2] 20 [2] 373 348 175 [2] 150 [2] 198 198 11       11 5 [3] 5 [3]                 5 5 484 244 264 [1] 29 [1] 77 [2] 77 [2] 143 138       1 [2] 21 [2]         70 [2] 20 [2] 373 348 175 [2] 150 [2] 198 198 70 [2] 20 [2]   373 348 175 [2] 150 [2] 198 198  
Unused capacity                 1,800     2,666   2,561 [1]   98 [2]   7         299 [2]         430 [2]   225   225 [2]       439   300 [1]   139 1,058 [3]   113   245 [2]   300 [2]   300 [2]   100   2,666   2,561 [1]   98 [2]   7         299 [2]           430 [2]   225   225 [2]       430 [2]     225   225 [2]        
Interest rate on outstanding borrowing   1.85% 1.87%             1.79%       2.04%                       1.65% 1.67%                                                       2.04%                       1.65% 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                                         $ 41                                                                                 $ 41                                                  
[1] At June 30, 2014, interest rates on outstanding borrowings were 2.04% for PPL Energy Supply and 1.65% 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 July 2014, the expiration dates for the WPD (South West), WPD (East Midlands), WPD (West Midlands), LG&E and KU syndicated credit facilities were extended to July 2019 and the PPL Electric syndicated credit facility was extended to October 2018. Also, in July 2014, PPL Energy Supply extended the expiration date for its uncommitted credit facility to July 2015.
[3] PPL WW's amounts borrowed at June 30, 2014 and December 31, 2013 were USD-denominated borrowings of $164 million and $166 million, which bore interest at 1.85% and 1.87%. At June 30, 2014, the unused capacity under the U.K. credit facilities was $1.8 billion.