CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Net income	$ 271		$ 200		$ 816		$ 605
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax	(179)		93		(103)		160
Available-for-sale securities, net of tax	(7)		1		15		13
Qualifying derivatives, net of tax	2		(30)		68		7
Equity investees' other comprehensive income (loss), net of tax	1		0		(3)		(1)
Defined benefit plans:
Net actuarial gain (loss), net of tax	(85)		0		(85)		0
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(1)		(1)		(4)		(8)
Qualifying derivatives, net of tax	(140)		(89)		(262)		(158)
Equity investee's other comprehensive (income) loss, net of tax	0		1		0		3
Defined benefit plans:
Prior service costs, net of tax	2		2		5		5
Net actuarial loss, net of tax	17		12		37		23
Total other comprehensive income (loss)	(390)		(11)		(332)		44
Comprehensive income (loss)	(119)		189		484		649
Comprehensive income attributable to noncontrolling interests	0		4		4		8
Comprehensive income (loss) attributable to Company	(119)		185		480		641
PPL Energy Supply LLC [Member]
Net income	19		89		328		303
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Available-for-sale securities, net of tax	(7)		1		15		13
Qualifying derivatives, net of tax	(9)		(21)		47		29
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax	(1)		(1)		(4)		(8)
Qualifying derivatives, net of tax	(108)		(68)		(247)		(147)
Equity investee's other comprehensive (income) loss, net of tax	0		1		0		3
Defined benefit plans:
Prior service costs, net of tax	2		1		3		2
Net actuarial loss, net of tax	1		1		6		2
Total other comprehensive income (loss)	(122)		(86)		(180)		(106)
Comprehensive income (loss) attributable to Company	(103)		3		148		197
PPL Electric Utilities Corp [Member]
Net income	29	[1]	40	[1]	66	[1]	96	[1]
LG And E And KU Energy LLC [Member]
Net income	44	[1]	41	[1]	97	[1]	128	[1]
Defined benefit plans:
Total other comprehensive income (loss)					(4)		(2)
Louisville Gas And Electric Co [Member]
Net income	26	[1]	20	[1]	51	[1]	59	[1]
Kentucky Utilities Co [Member]
Net income	30	[1]	30	[1]	68	[1]	88	[1]
Defined benefit plans:
Total other comprehensive income (loss)					$ (4)		$ (1)

[1] Net income approximates comprehensive income.