CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax effect of foreign currency translation adjustments arising during the period	$ 1	$ (8)	$ 4
Tax effect of available-for-sale securities arising during the period	(9)	(39)	(72)
Tax effect of qualifying derivatives arising during the period	0	23	(41)
Tax effect of defined benefit plans - prior service costs arising during period	6	(4)	(1)
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	67	225	(73)
Tax effect of available-for-sale securities reclassified to net income	2	7	4
Tax effect of qualifying derivatives reclassified to net income	(15)	23	80
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	(3)	(4)
Tax effect of net actuarial loss reclassified to net income	(46)	(34)	(49)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - prior service costs arising during period	2	4	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	2	32	(18)
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	(1)	0	0
Tax effect of net actuarial loss reclassified to net income	$ (3)	$ 0	$ 0