Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)	$ 361	$ 7	$ 357	$ (5,616)
Other comprehensive income (loss), net of income taxes:
Other comprehensive income (loss), net of income taxes	2	1	6	3
Comprehensive income (loss)	363	8	363	(5,613)
Comprehensive (income) loss attributable to noncontrolling interest	4	(1)	4	2
Comprehensive income (loss) attributable to company shareholders	$ 367	$ 7	$ 367	$ (5,611)