Supplemental Financial Statement Information (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ 434	$ 291	$ 763
Revenue	90,272	74,989	66,001
Provision for income taxes	(4,672)	(3,303)	(3,639)
Net of tax	19,478	16,348	14,136
Total amount reclassified, net of tax	130	795	258
Reclassification out of AOCI | Unrealized gains (losses) on available-for-sale investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	(221)	(208)	153
Provision for income taxes	0	0	(19)
Net of tax	(221)	(208)	134
Reclassification out of AOCI | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	351	1,003	124
Reclassification out of AOCI | Foreign exchange contracts | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	539	1,399	171
Reclassification out of AOCI | Foreign exchange contracts | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	5	5	4
Provision for income taxes	$ (193)	$ (401)	$ (51)