Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues									$ (1,771)	$ (1,663)	$ (1,492)
Sales and marketing									(2,267)	(2,442)	(2,144)
Product development									(923)	(983)	(915)
General and administrative									(1,122)	(889)	(880)
Interest and other, net									209	39	117
Income from continuing operations before income taxes									2,406	2,515	2,571
Provision for income taxes									(459)	(3,380)	(504)
Income (loss) from continuing operations	$ 523	$ 545	$ 430	$ 449	$ 729	$ 509	$ 458	$ (2,561)	1,947	(865)	2,067
Income (loss) from discontinued operations, net of income taxes	(46)	(6)	(347)	177	294	164	218	235	(222)	911	789
Net income	$ 477	$ 539	$ 83	$ 626	$ 1,023	$ 673	$ 676	$ (2,326)	1,725	46	$ 2,856
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									205	16
Gains (Losses) on Cash Flow Hedges - Foreign Exchange Contracts | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues									24	0
Sales and marketing									5	1
Product development									34	0
General and administrative									8	(1)
Income from continuing operations before income taxes									71	0
Provision for income taxes									0	0
Income (loss) from continuing operations									71	0
Income (loss) from discontinued operations, net of income taxes									133	(36)
Net income									204	(36)
Unrealized gains (losses) on investments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other, net									1	52
Income from continuing operations before income taxes									1	52
Provision for income taxes									0	0
Net income									$ 1	$ 52