Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 1,309	$ 958	$ 2,454	$ 1,796
Other Comprehensive Income:
Change in pension and retiree health and welfare benefits, net of tax	0	(1)	0	(1)
Change in accumulated other comprehensive income (loss) of equity method investees	0	1	1	(1)
Other comprehensive income (loss), net of tax	0	0	1	(2)
Total comprehensive income	$ 1,309	$ 958	$ 2,455	$ 1,794