Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended				12 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2012 PPL Energy Supply LLC [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member]	Sep. 30, 2012 PPL Energy Supply LLC [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member]	Sep. 30, 2012 PPL Energy Supply LLC [Member] PPL Electric [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member] PPL Electric [Member]	Sep. 30, 2012 PPL Energy Supply LLC [Member] PPL Electric [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member] PPL Electric [Member]	Sep. 30, 2012 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2012 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2011 PPL Energy Supply LLC [Member] Services Company Affiliate [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] PPL Energy Funding [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] PPL Energy Supply [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] PPL Energy Supply [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] PPL Energy Supply [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] PPL Energy Supply [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] Services Company Affiliate [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] PPL Power Insurance [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] PPL Power Insurance [Member]	Sep. 30, 2011 PPL Electric Utilities Corp [Member] PPL Power Insurance [Member]	Sep. 30, 2012 PPL Electric Utilities Corp [Member] Certain Affiliates [Member]	Sep. 30, 2012 LG And E And KU Energy LLC [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member]	Sep. 30, 2012 LG And E And KU Energy LLC [Member] PPL Energy Supply [Member]	Sep. 30, 2012 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2011 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2012 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2011 LG And E And KU Energy LLC [Member] Services Company Affiliate [Member]	Sep. 30, 2012 LG And E And KU Energy LLC [Member] PPL Affiliate [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] PPL Affiliate [Member]	Sep. 30, 2012 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2011 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2012 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2011 Louisville Gas And Electric Co [Member] Services Company Affiliate [Member]	Sep. 30, 2012 Louisville Gas And Electric Co [Member] Parent And Affiliate [Member]	Sep. 30, 2012 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2011 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2012 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2011 Kentucky Utilities Co [Member] Services Company Affiliate [Member]	Sep. 30, 2012 Kentucky Utilities Co [Member] Parent And Affiliate [Member]
PLR Contracts/Purchase of Accounts Receivable (Numeric) [Abstract]
Sales of energy supply from affiliates						$ 22	$ 5	$ 60	$ 15
Purchases of energy supply from affiliates																	22	5	60	15
Credit limit with affiliate under a Master Supply Agreement								35
Credit exposure with affiliate under a Master Supply Agreement								39
Allocations of Corporate Service Costs (Details) [Abstract]
Service cost allocations from parent to subsidiary										49	44	159	138								35	34	116	108								3	3	11	12
Intercompany Billings by LKS (Details) [Abstract]
Intercompany billings between affiliates																																						51	51	132	134		33	44	114	148
Intercompany Borrowings (Numeric) [Abstract]
Notes receivable from affiliates					198										210														6	15
Intercompany borrowings demand note rate on outstanding borrowing														3.77%														1.98%	2.23%	2.27%						2.23%	2.27%
Intercompany note with affiliate maximum borrowing capacity																															300					300						500					500
Interest earned on the borrowings	1	2	2	6
Trademark Royalties (Numeric) [Abstract]
Trademark royalty license expense		10		30
Intercompany Insurance (Numeric) [Abstract]
Probable recoveries on insurance claims																									26.5		26.5
Probable recoveries on insurance claims recorded in other operation and maintenance																									7		16
Proceeds received from insurance settlement																										$ 26.5