CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Tax effect of foreign currency translation adjustments arising during the period	$ (2)	$ 0	$ (2)	$ (1)
Tax effect of qualifying derivatives arising during the period	(4)	5	0	7
Tax effect of defined benefit plans - prior service costs arising during period	0	0	0	0
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	7	0	7
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	3	(7)	1	(7)
Tax effect of equity investees' other comprehensive (income) loss reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss)	(9)	(9)	(18)	(18)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	7	0	7
Tax effect of equity investees' other comprehensive (income) loss reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss)	$ 0	$ (1)	$ (1)	$ (2)