CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Net income	$ 355		$ 449		$ 1,171		$ 1,054
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax	152		(4)		49		156
Available-for-sale securities, net of tax	13		(26)		28		(13)
Qualifying derivatives, net of tax	(41)		41		27		48
Equity investees' other comprehensive income (loss), net of tax					(3)		(1)
Defined benefit plans:
Net actuarial gain (loss), net of tax			1		(85)		1
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax			2		(4)		(6)
Qualifying derivatives, net of tax	(61)		(94)		(323)		(252)
Equity investee's other comprehensive (income) loss, net of tax							3
Defined benefit plans:
Prior service costs, net of tax	1		2		6		7
Net actuarial loss, net of tax	17		13		54		36
Total other comprehensive income (loss)	81		(65)		(251)		(21)
Comprehensive income (loss)	436		384		920		1,033
Comprehensive income attributable to noncontrolling interests			5		4		13
Comprehensive income (loss) attributable to Shareowners	436		379		916		1,020
PPL Energy Supply LLC [Member]
Net income	55		170		383		473
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Available-for-sale securities, net of tax	13		(26)		28		(13)
Qualifying derivatives, net of tax	(1)		39		46		68
Defined benefit plans:
Net actuarial gain (loss), net of tax			1				1
Reclassifications to net income - (gains) losses, net of tax expense (benefit):
Available-for-sale securities, net of tax			2		(4)		(6)
Qualifying derivatives, net of tax	(92)		(73)		(339)		(220)
Equity investee's other comprehensive (income) loss, net of tax							3
Defined benefit plans:
Prior service costs, net of tax	1		1		4		3
Net actuarial loss, net of tax	2		1		8		3
Total other comprehensive income (loss)	(77)		(55)		(257)		(161)
Comprehensive income (loss)	(22)		115		126		312
Comprehensive income attributable to noncontrolling interests	1		1		1		1
Comprehensive income (loss) attributable to Shareowners	(23)		114		125		311
PPL Electric Utilities Corp [Member]
Net income	33	[1]	32	[1]	99	[1]	128	[1]
LG And E And KU Energy LLC [Member]
Net income	83	[1]	89	[1]	180	[1]	217	[1]
Defined benefit plans:
Total other comprehensive income (loss)					(4)		(2)
Louisville Gas And Electric Co [Member]
Net income	43	[1]	43	[1]	94	[1]	102	[1]
Kentucky Utilities Co [Member]
Net income	$ 50	[1]	$ 56	[1]	$ 118	[1]	$ 144	[1]

[1] Net income approximates comprehensive income.