Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,553	$ 1,624	$ 1,439
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(59)	(55)	(59)
Change in unrealized gains and losses on cash flow hedges, net of taxes	51	75	213
Change in unrealized losses on available-for-sale investment securities, net of taxes	0	(3)	(1)
Other comprehensive income (loss)	(8)	17	153
Comprehensive income	$ 1,545	$ 1,641	$ 1,592