Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Line Items]

Asset Retirement Obligation Roll Forward

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

		PPL				PPL Energy Supply
		2014		2013		2014		2013
ARO at beginning of period		$	705	$	552	$	404	$	375
	Accretion		48		38		32		29
	Obligations incurred		14		6		13		6
	Changes in estimated cash flow or settlement date		9		123		(16)		1
	Effect of foreign currency exchange rates		(2)		1
	Obligations settled		(13)		(15)		(8)		(7)
ARO at end of period		$	761	$	705	$	425	$	404

			LKE				LG&E				KU
			2014		2013		2014		2013		2014		2013
ARO at beginning of period			$	252	$	131	$	74	$	62	$	178	$	69
	Accretion			14		7		4		3		10		4
	Obligations incurred			1								1
	Changes in estimated cash flow
		or settlement date		23		122		1		17		22		105
	Obligations settled			(5)		(8)		(5)		(8)
ARO at end of period			$	285	$	252	$	74	$	74	$	211	$	178

PPL Energy Supply LLC [Member]

Asset Retirement Obligation [Line Items]

Asset Retirement Obligation Roll Forward

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

		PPL				PPL Energy Supply
		2014		2013		2014		2013
ARO at beginning of period		$	705	$	552	$	404	$	375
	Accretion		48		38		32		29
	Obligations incurred		14		6		13		6
	Changes in estimated cash flow or settlement date		9		123		(16)		1
	Effect of foreign currency exchange rates		(2)		1
	Obligations settled		(13)		(15)		(8)		(7)
ARO at end of period		$	761	$	705	$	425	$	404

			LKE				LG&E				KU
			2014		2013		2014		2013		2014		2013
ARO at beginning of period			$	252	$	131	$	74	$	62	$	178	$	69
	Accretion			14		7		4		3		10		4
	Obligations incurred			1								1
	Changes in estimated cash flow
		or settlement date		23		122		1		17		22		105
	Obligations settled			(5)		(8)		(5)		(8)
ARO at end of period			$	285	$	252	$	74	$	74	$	211	$	178

LG And E And KU Energy LLC [Member]

Asset Retirement Obligation [Line Items]

Asset Retirement Obligation Roll Forward

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

		PPL				PPL Energy Supply
		2014		2013		2014		2013
ARO at beginning of period		$	705	$	552	$	404	$	375
	Accretion		48		38		32		29
	Obligations incurred		14		6		13		6
	Changes in estimated cash flow or settlement date		9		123		(16)		1
	Effect of foreign currency exchange rates		(2)		1
	Obligations settled		(13)		(15)		(8)		(7)
ARO at end of period		$	761	$	705	$	425	$	404

			LKE				LG&E				KU
			2014		2013		2014		2013		2014		2013
ARO at beginning of period			$	252	$	131	$	74	$	62	$	178	$	69
	Accretion			14		7		4		3		10		4
	Obligations incurred			1								1
	Changes in estimated cash flow
		or settlement date		23		122		1		17		22		105
	Obligations settled			(5)		(8)		(5)		(8)
ARO at end of period			$	285	$	252	$	74	$	74	$	211	$	178

Louisville Gas And Electric Co [Member]

Asset Retirement Obligation [Line Items]

Asset Retirement Obligation Roll Forward

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

		PPL				PPL Energy Supply
		2014		2013		2014		2013
ARO at beginning of period		$	705	$	552	$	404	$	375
	Accretion		48		38		32		29
	Obligations incurred		14		6		13		6
	Changes in estimated cash flow or settlement date		9		123		(16)		1
	Effect of foreign currency exchange rates		(2)		1
	Obligations settled		(13)		(15)		(8)		(7)
ARO at end of period		$	761	$	705	$	425	$	404

			LKE				LG&E				KU
			2014		2013		2014		2013		2014		2013
ARO at beginning of period			$	252	$	131	$	74	$	62	$	178	$	69
	Accretion			14		7		4		3		10		4
	Obligations incurred			1								1
	Changes in estimated cash flow
		or settlement date		23		122		1		17		22		105
	Obligations settled			(5)		(8)		(5)		(8)
ARO at end of period			$	285	$	252	$	74	$	74	$	211	$	178

Kentucky Utilities Co [Member]

Asset Retirement Obligation [Line Items]

Asset Retirement Obligation Roll Forward

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

		PPL				PPL Energy Supply
		2014		2013		2014		2013
ARO at beginning of period		$	705	$	552	$	404	$	375
	Accretion		48		38		32		29
	Obligations incurred		14		6		13		6
	Changes in estimated cash flow or settlement date		9		123		(16)		1
	Effect of foreign currency exchange rates		(2)		1
	Obligations settled		(13)		(15)		(8)		(7)
ARO at end of period		$	761	$	705	$	425	$	404

			LKE				LG&E				KU
			2014		2013		2014		2013		2014		2013
ARO at beginning of period			$	252	$	131	$	74	$	62	$	178	$	69
	Accretion			14		7		4		3		10		4
	Obligations incurred			1								1
	Changes in estimated cash flow
		or settlement date		23		122		1		17		22		105
	Obligations settled			(5)		(8)		(5)		(8)
ARO at end of period			$	285	$	252	$	74	$	74	$	211	$	178