Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligations [Line Items]

Asset Retirement Obligation Roll Forward

The changes in the carrying amounts of AROs were as follows.

		PPL				PPL Energy Supply
		2012		2011		2012		2011
ARO at beginning of period		$	497	$	448	$	359	$	345
	Accretion expense		36		33		28		26
	Obligations assumed in acquisition of WPD Midlands (a)				15
	Derecognition (b)								(5)
	Obligations incurred		9		14		3		11
	Changes in estimated cash flow or settlement date		31		5		(7)		(1)
	Effect of foreign currency exchange rates		1
	Obligations settled		(22)		(18)		(8)		(17)
ARO at end of period		$	552	$	497	$	375	$	359

			LKE				LG&E				KU
			2012		2011		2012		2011		2012		2011
ARO at beginning of period			$	118	$	103	$	57	$	49	$	61	$	54
	Accretion expense			6		6		3		3		3		3
	Obligations incurred			6		3				2		6		1
	Changes in estimated cash flow
		or settlement date		15		7		5		4		10		3
	Obligations settled			(14)		(1)		(3)		(1)		(11)
ARO at end of period			$	131	$	118	$	62	$	57	$	69	$	61

(a)       Obligations required under U.K. law related to treated wood poles, gas-filled switchgear and fluid-filled cables. See Note 10for additional information on the acquisition.

PPL Energy Supply LLC [Member]

Asset Retirement Obligations [Line Items]

Asset Retirement Obligation Roll Forward

		PPL				PPL Energy Supply
		2012		2011		2012		2011
ARO at beginning of period		$	497	$	448	$	359	$	345
	Accretion expense		36		33		28		26
	Obligations assumed in acquisition of WPD Midlands (a)				15
	Derecognition (b)								(5)
	Obligations incurred		9		14		3		11
	Changes in estimated cash flow or settlement date		31		5		(7)		(1)
	Effect of foreign currency exchange rates		1
	Obligations settled		(22)		(18)		(8)		(17)
ARO at end of period		$	552	$	497	$	375	$	359

			LKE				LG&E				KU
			2012		2011		2012		2011		2012		2011
ARO at beginning of period			$	118	$	103	$	57	$	49	$	61	$	54
	Accretion expense			6		6		3		3		3		3
	Obligations incurred			6		3				2		6		1
	Changes in estimated cash flow
		or settlement date		15		7		5		4		10		3
	Obligations settled			(14)		(1)		(3)		(1)		(11)
ARO at end of period			$	131	$	118	$	62	$	57	$	69	$	61

(b)       Represents AROs derecognized as a result of PPL Energy Supply's distribution of its membership interest in PPL Global to PPL Energy Supply's parent, PPL Energy Funding. See Note 9 for additional information on the distribution.

LG And E And KU Energy LLC [Member]

Asset Retirement Obligations [Line Items]

Asset Retirement Obligation Roll Forward

		PPL				PPL Energy Supply
		2012		2011		2012		2011
ARO at beginning of period		$	497	$	448	$	359	$	345
	Accretion expense		36		33		28		26
	Obligations assumed in acquisition of WPD Midlands (a)				15
	Derecognition (b)								(5)
	Obligations incurred		9		14		3		11
	Changes in estimated cash flow or settlement date		31		5		(7)		(1)
	Effect of foreign currency exchange rates		1
	Obligations settled		(22)		(18)		(8)		(17)
ARO at end of period		$	552	$	497	$	375	$	359

			LKE				LG&E				KU
			2012		2011		2012		2011		2012		2011
ARO at beginning of period			$	118	$	103	$	57	$	49	$	61	$	54
	Accretion expense			6		6		3		3		3		3
	Obligations incurred			6		3				2		6		1
	Changes in estimated cash flow
		or settlement date		15		7		5		4		10		3
	Obligations settled			(14)		(1)		(3)		(1)		(11)
ARO at end of period			$	131	$	118	$	62	$	57	$	69	$	61

Louisville Gas And Electric Co [Member]

Asset Retirement Obligations [Line Items]

Asset Retirement Obligation Roll Forward

		PPL				PPL Energy Supply
		2012		2011		2012		2011
ARO at beginning of period		$	497	$	448	$	359	$	345
	Accretion expense		36		33		28		26
	Obligations assumed in acquisition of WPD Midlands (a)				15
	Derecognition (b)								(5)
	Obligations incurred		9		14		3		11
	Changes in estimated cash flow or settlement date		31		5		(7)		(1)
	Effect of foreign currency exchange rates		1
	Obligations settled		(22)		(18)		(8)		(17)
ARO at end of period		$	552	$	497	$	375	$	359

			LKE				LG&E				KU
			2012		2011		2012		2011		2012		2011
ARO at beginning of period			$	118	$	103	$	57	$	49	$	61	$	54
	Accretion expense			6		6		3		3		3		3
	Obligations incurred			6		3				2		6		1
	Changes in estimated cash flow
		or settlement date		15		7		5		4		10		3
	Obligations settled			(14)		(1)		(3)		(1)		(11)
ARO at end of period			$	131	$	118	$	62	$	57	$	69	$	61

Kentucky Utilities Co [Member]

Asset Retirement Obligations [Line Items]

Asset Retirement Obligation Roll Forward

		PPL				PPL Energy Supply
		2012		2011		2012		2011
ARO at beginning of period		$	497	$	448	$	359	$	345
	Accretion expense		36		33		28		26
	Obligations assumed in acquisition of WPD Midlands (a)				15
	Derecognition (b)								(5)
	Obligations incurred		9		14		3		11
	Changes in estimated cash flow or settlement date		31		5		(7)		(1)
	Effect of foreign currency exchange rates		1
	Obligations settled		(22)		(18)		(8)		(17)
ARO at end of period		$	552	$	497	$	375	$	359

			LKE				LG&E				KU
			2012		2011		2012		2011		2012		2011
ARO at beginning of period			$	118	$	103	$	57	$	49	$	61	$	54
	Accretion expense			6		6		3		3		3		3
	Obligations incurred			6		3				2		6		1
	Changes in estimated cash flow
		or settlement date		15		7		5		4		10		3
	Obligations settled			(14)		(1)		(3)		(1)		(11)
ARO at end of period			$	131	$	118	$	62	$	57	$	69	$	61