Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income (loss)	$ 47	$ (32)
Other comprehensive income (loss), net of income taxes	(2)	2
Comprehensive income (loss)	45	(30)
Comprehensive income attributable to noncontrolling interest	(1)	0
Comprehensive income (loss) attributable to company shareholders	$ 44	$ (30)