Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,246		$ 1,124		$ 2,375		$ 2,078
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	6		(16)		15		(18)
Cash flow hedges, net of tax	1		0		2		1
Other comprehensive income	7	[1]	(16)	[1]	17	[1]	(17)	[1]
Comprehensive income	$ 1,253		$ 1,108		$ 2,392		$ 2,061

[1] All amounts are net of tax.