Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues	$ 561	$ 493	$ 1,076	$ 970
Sales and marketing	637	622	1,199	1,160
Product development	313	295	591	534
General and administrative	267	218	512	427
Interest and other, net	(18)	(8)	(6)	(31)
Income before income taxes	460	523	1,018	1,114
Provision for income taxes	(433)	(86)	44	(195)
Net income	27	435	1,062	917
Total reclassifications for the period	20	(8)	52	3
Reclassification out of Accumulated Other Comprehensive Income | Gains (losses) on cash flow hedges - foreign exchange contracts | Foreign Exchange Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues	1	(1)	3	1
Sales and marketing	0	0	1	0
Product development	2	0	5	2
General and administrative	1	0	2	0
Interest and other, net	11	21	24	33
Income before income taxes	15	20	35	36
Provision for income taxes	0	0	0	0
Net income	15	20	35	36
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other, net	5	(28)	17	(33)
Income before income taxes	5	(28)	17	(33)
Provision for income taxes	0	0	0	0
Net income	$ 5	$ (28)	$ 17	$ (33)