Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,341	$ 1,442	$ 3,389	$ 2,009
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(645)	(79)	(596)	(131)
Unrealized gains (losses) on securities, net	2	(6)	2	(3)
Defined benefit plans, net	154	280	643	304
Other comprehensive income (loss), net of tax	(489)	195	49	170
Comprehensive income	852	1,637	3,438	2,179
Comprehensive (income) loss attributable to noncontrolling interests	16	37	22	(34)
Comprehensive income attributable to stockholders	$ 868	$ 1,674	$ 3,460	$ 2,145