Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 1,253	$ 1,145
Other Comprehensive Income:
Change in pension and retiree health and welfare benefits, net of tax	63	0
Change in accumulated other comprehensive income (loss) of equity method investees	(1)	1
Other comprehensive income (loss), net of tax	62	1
Total comprehensive income	$ 1,315	$ 1,146