Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,654	$ 1,359	$ 4,911	$ 3,954
Other comprehensive income (loss):
Net unrealized securities (losses) gains, net of tax	(11)	(2)	(29)	4
Foreign currency translation adjustments, net of tax	(19)	107	(85)	456
Net unrealized Pension and other postretirement benefits, net of tax	9	7	38	8
Other comprehensive income (loss)	(21)	112	(76)	468
Comprehensive income	$ 1,633	$ 1,471	$ 4,835	$ 4,422