Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income	$ 4,248	$ 3,869	$ 3,793
Other comprehensive income:
Change in Pension and Retiree Health and Welfare benefits, net of tax expense of $31 million, tax benefit of $156 million and tax expense of $305 million, respectively	50	(251)	492
Change in accumulated other comprehensive income of equity method investees	0	4	(2)
Other comprehensive income (loss), net of tax	50	(247)	490
Total comprehensive income	$ 4,298	$ 3,622	$ 4,283