Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,142	$ 1,266	$ 4,583	$ 4,264
Other comprehensive income (loss):
Net unrealized securities gains, net of tax	(15)	(7)	(8)	(27)
Foreign currency translation adjustments, net of tax	11	(220)	(115)	(464)
Pension and other postretirement benefit gains	7	7	39	36
Other comprehensive income (loss)	3	(220)	(84)	(455)
Comprehensive income	$ 1,145	$ 1,046	$ 4,499	$ 3,809