CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Tax effect of foreign currency translation adjustments arising during the period	$ 0	$ (1)
Tax effect of qualifying derivatives arising during the period	4	2
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	0
Tax effect of qualifying derivatives reclassified from accumulated other comprehensive income (loss)	(2)	0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss)	(9)	(9)
LG And E And KU Energy LLC [Member]
Tax effect of defined benefit plans - net actuarial gain (loss) arising during period	0	0
Tax effect of equity investees' other comprehensive income (loss) reclassified from accumulated other comprehensive income (loss)	0	0
Tax effect of prior service costs reclassified from accumulated other comprehensive income (loss)	0	0
Tax effect of net actuarial (gain) loss reclassified from accumulated other comprehensive income (loss)	$ (1)	$ (1)