CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax effect of foreign currency translation adjustments arising during the period	$ 0	$ 0	$ (2)
Tax effect of qualifying derivatives arising during the period	5	2	(9)
Tax effect of defined benefit plans - prior service costs arising during period	0	0	3
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	74	119	44
Tax effect of qualifying derivatives reclassified from AOCI	8	5	(6)
Tax effect of defined benefit plans - prior service costs reclassified from AOCI	(1)	(1)	0
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified from AOCI	(51)	(22)	(36)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - prior service costs arising during period	0	0	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	2	2	(2)
Tax effect of defined benefit plans - prior service costs reclassified from AOCI	0	0	0
Tax effect of defined benefit plans - net actuarial (gain) loss reclassified from AOCI	$ 4	$ 1	$ 3