CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Tax effect of foreign currency translation adjustments arising during the period	$ 0	$ 0	$ 1	$ (1)
Tax effect of available-for-sale securities arising during the period	(1)	21	(13)	10
Tax effect of qualifying derivatives arising during the period	21	114	(11)	(148)
Tax effect of equity investees' other comprehensive income (loss) arising during the period	0	0	0	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	(31)	0	(31)
Tax effect of available-for-sale securities reclassified to net income	0	0	5	2
Tax effect of qualifying derivatives reclassified to net income	55	1	106	38
Tax effect of equity investees' other comprehensive income (loss) reclassified to net income	0	0	0	0
Tax effect of prior service costs reclassified to net income	(1)	(1)	(3)	(4)
Tax effect of net actuarial loss reclassified to net income	(6)	(6)	(10)	(6)
Tax effect of transition obligation reclassified to net income	0	(1)	0	(1)
PPL Energy Supply [Member]
Tax effect of foreign currency translation adjustments arising during the period	0	0	0	(1)
Tax effect of available-for-sale securities arising during the period	(1)	21	(13)	10
Tax effect of qualifying derivatives arising during the period	13	75	(21)	(190)
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	(31)	0	(31)
Tax effect of available-for-sale securities reclassified to net income	0	0	5	2
Tax effect of qualifying derivatives reclassified to net income	49	0	103	38
Tax effect of prior service costs reclassified to net income	(1)	0	(2)	(3)
Tax effect of net actuarial loss reclassified to net income	$ (1)	$ (5)	$ (1)	$ (6)