Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended													2 Months Ended		12 Months Ended											12 Months Ended		2 Months Ended	12 Months Ended		10 Months Ended		12 Months Ended		2 Months Ended	12 Months Ended		10 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 PPL Energy Supply LLC [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member]	Dec. 31, 2012 PPL Energy Supply LLC [Member] PPL Electric [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] PPL Energy Funding [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] PPL Energy Funding [Member]	Dec. 31, 2011 PPL Energy Supply LLC [Member] Certain Affiliates [Member]	Dec. 31, 2010 PPL Energy Supply LLC [Member] Certain Affiliates [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member]	Dec. 31, 2010 PPL Electric Utilities Corp [Member]	Dec. 31, 2012 PPL Electric Utilities Corp [Member] PPL Power Insurance [Member]	Dec. 31, 2011 PPL Electric Utilities Corp [Member] PPL Power Insurance [Member]	Dec. 31, 2010 LG And E And KU Energy LLC [Member]		Dec. 31, 2012 LG And E And KU Energy LLC [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] PPL Energy Funding [Member]	Dec. 31, 2011 LG And E And KU Energy LLC [Member] PPL Energy Funding [Member]	Dec. 31, 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]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member] PPL Affiliate [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] KU [Member]	Dec. 31, 2012 LG And E And KU Energy LLC [Member] KU [Member] PPL Affiliate [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Parent And Affiliate [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] PPL Affiliate [Member]	Dec. 31, 2010 Louisville Gas And Electric Co [Member] Successor [Member]	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Successor [Member]	Dec. 31, 2011 Louisville Gas And Electric Co [Member] Successor [Member]	Oct. 31, 2010 Louisville Gas And Electric Co [Member] Predecessor [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Parent And Affiliate [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] PPL Affiliate [Member]	Dec. 31, 2010 Kentucky Utilities Co [Member] Successor [Member]	Dec. 31, 2012 Kentucky Utilities Co [Member] Successor [Member]	Dec. 31, 2011 Kentucky Utilities Co [Member] Successor [Member]	Oct. 31, 2010 Kentucky Utilities Co [Member] Predecessor [Member]
PLR Contracts/Purchase of Accounts Receivable (Numeric) [Abstract]
Credit limit with affiliate under a Master Supply Agreement					$ 35
Credit exposure with affiliate under a Master Supply Agreement					27
Allocations of Corporate Service Costs (Details) [Abstract]
Service cost allocations from parent to subsidiary		212	189	232						157	145	134			3	[1]	15	16
Intercompany Billings by LKS (Details) [Abstract]
Intercompany billings between affiliates																														32	186	190	200				34	161	204	222
Intercompany Borrowings (Numeric) [Abstract]
Notes receivable from affiliates			198															15
Intercompany borrowings demand note rate on outstanding borrowing						3.77%														1.71%		2.27%
Notes Payable, Related Parties, Current																	25
Intercompany note with affiliate maximum borrowing capacity																			300		300	300						500							500
Interest earned on the borrowings		2	8	9		8	5
Intercompany Derivatives (Numeric) [Abstract]
Notional value of interest rate cash flow hedge contracts (excludes cross-currency contracts)	1,200																						150	150	150	150	150		150					150		150
Trademark Royalties (Numeric) [Abstract]
Trademark royalty license expense								40	40
Intercompany Insurance (Numeric) [Abstract]
Probable recoveries on insurance claims													18.25	26.50
Probable recoveries on insurance claims recorded in other operation and maintenance													14	16
Proceeds received from insurance settlement													$ 26.50

[1] Represents costs allocated during the two months ended December 31, 2010 as LKE was acquired November 1, 2010.