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
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,356	$ 1,142	$ 3,933	$ 4,583
Other comprehensive income (loss):
Net unrealized securities (losses) gains, net of tax	(2)	(15)	4	(8)
Foreign currency translation adjustments, net of tax	107	11	456	(115)
Net unrealized Pension and other postretirement benefits, net of tax	7	7	8	39
Other comprehensive income (loss)	112	3	468	(84)
Comprehensive income	$ 1,468	$ 1,145	$ 4,401	$ 4,499