CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax effect of foreign currency translation adjustments arising during the period	$ (2)	$ (1)	$ (4)
Tax effect of qualifying derivatives arising during the period	(9)	19	(18)
Tax effect of defined benefit plans - prior service costs arising during period	3	0	2
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	44	72	40
Tax effect of qualifying derivatives reclassified to net income	6	(18)	21
Tax effect of defined benefit plans - prior service costs reclassified to net income	0	(1)	(1)
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified to net income	(36)	(37)	(35)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - prior service costs arising during period	0	(1)	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	13	18
Tax effect of equity investees' other comprehensive (income) loss reclassified to net income	0	0	0
Tax effect of defined benefit plans - prior service costs reclassified to net income	0	1	1
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified to net income	$ 5	$ 2	$ 1