Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 PPL Energy Supply LLC [Member] PPL Electric [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2013 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2014 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2013 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2013 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2014 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2013 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Dec. 31, 2013 PPL Electric Utilities Corp [Member] PPL Energy Funding [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2013 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2013 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member] PPL Energy Funding [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member] PPL Energy Funding [Member]	Dec. 31, 2013 LG And E And KU Energy LLC [Member] PPL Affiliate [Member]	Sep. 30, 2014 LG And E And KU Energy LLC [Member] PPL Affiliate [Member]	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2013 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2014 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2013 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2014 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2013 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2014 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2013 Kentucky Utilities Co [Member] Services Company Affiliate [Member]
PLR Contracts/Purchase of Accounts Receivable (Numeric) [Abstract]
Credit exposure with affiliate under a Master Supply Agreement	$ 27
Support Costs (Details) [Abstract]
Support cost allocations from subsidiary of parent to registrant		49	52	161	161			34	37	113	109				3	3	11	11
Intercompany Billings by LKS (Details) [Abstract]
Intercompany billings between affiliates																							49	53	154	159	55	36	167	146
Intercompany Borrowings (Numeric) [Abstract]
Notes receivable from affiliates						0	150						0	70
Intercompany borrowings demand note rate on outstanding borrowing												1.92%							1.66%		2.17%
Notes payable to affiliates													22	0
Intercompany note with affiliate maximum borrowing capacity																				$ 225		$ 300