CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax effect of foreign currency translation adjustments arising during the period	$ (8)	$ 4	$ 2
Tax effect of available-for-sale securities arising during the period	(39)	(72)	(31)
Tax effect of qualifying derivatives arising during the period	23	(41)	(32)
Tax effect of equity investees' other comprehensive income (loss) arising during the period	0	0	(1)
Tax effect of defined benefit plans - prior service costs arising during period	(4)	(1)	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	225	(73)	343
Tax effect of available-for-sale securities reclassified to net income	7	4	1
Tax effect of qualifying derivatives reclassified to net income	23	80	278
Tax effect of prior service costs reclassified to net income	(3)	(4)	(5)
Tax effect of net actuarial loss reclassified to net income	(34)	(49)	(29)
PPL Energy Supply LLC [Member]
Tax effect of available-for-sale securities arising during the period	(40)	(72)	(31)
Tax effect of qualifying derivatives arising during the period	0	0	(46)
Tax effect of defined benefit plans - prior service costs arising during period	(6)	(1)	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	83	(49)	56
Tax effect of available-for-sale securities reclassified to net income	7	4	1
Tax effect of qualifying derivatives reclassified to net income	17	84	291
Tax effect of prior service costs reclassified to net income	(1)	(3)	(2)
Tax effect of net actuarial loss reclassified to net income	(4)	(10)	(2)
LG And E And KU Energy LLC [Member]
Tax effect of equity investees' other comprehensive income (loss) arising during the period	0	0	(1)
Tax effect of defined benefit plans - prior service costs arising during period	4	0	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	32	(18)	13
Tax effect of equity investees' other comprehensive (income) loss reclassified to net income	0	0	0
Tax effect of prior service costs reclassified to net income	0	0	0
Tax effect of net actuarial loss reclassified to net income	$ 0	$ 0	$ 0