Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 948		$ 1,249		$ 3,323		$ 3,327
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(29)		3		(14)		(15)
Cash flow hedges, net of tax	1		1		3		2
Other comprehensive income (loss)	(28)	[1]	4	[1]	(11)	[1]	(13)	[1]
Comprehensive income	$ 920		$ 1,253		$ 3,312		$ 3,314

[1] All amounts are net of tax.