Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income	$ 4,345	$ 3,683	$ 4,627
Other comprehensive income (loss), net of reclassification adjustments and taxes:
Foreign currency translation losses	(9)	(1)	(18)
Gains (losses) on the effective portion of cash flow hedges	(78)	40	85
Net unrealized gains (losses) on available-for-sale securities	63	(15)	40
Other gains (losses)	(1)	(6)	1
Other comprehensive income (loss), net of tax	(25)	18	108
Comprehensive income	$ 4,320	$ 3,701	$ 4,735