Supplemental Financial Statement Information (Components of Other Income (Expense), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Interest income	$ 1,220	$ 999	$ 746
Interest expense	(124)	(104)	(101)
Foreign currency exchange losses, net	(475)	(422)	(402)
Gain (loss) on marketable securities, net	(210)	(208)	153
Gain (loss) on non-marketable investments, net	(65)	(126)	237
Other	88	152	130
Other income (expense), net	434	291	763
Foreign currency loss net of recognized foreign exchange contracts	$ 112	$ 123	$ 107