Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 1,042	$ 1,020	$ 2,838	$ 2,576
Other comprehensive income:
Change in Pension and Retiree Health and Welfare benefits, net of tax	0	(1)	(1)	(1)
Change in accumulated other comprehensive income (loss) of equity method investees	0	0	(1)	(1)
Other comprehensive income (loss), net of tax	0	(1)	(2)	(2)
Total comprehensive income	$ 1,042	$ 1,019	$ 2,836	$ 2,574