Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues	$ 608		$ 1,764
Sales and marketing	852		2,446
Product development	307	$ 316	993	$ 907
General and administrative	248	254	886	766
Interest and other, net	392	120	661	113
Income before income taxes	948	694	2,202	1,714
Provision for income taxes	(228)	(174)	(437)	(130)
Total reclassifications for the period	9	(11)	(30)	41
Reclassification out of Accumulated Other Comprehensive Income \| Gains (losses) on cash flow hedges - foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Revenues	12	(7)
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]
Net Revenues			(37)	(7)
Cost of net revenues	0	0	0	3
Sales and marketing	0	0	0	1
Product development	0	0	0	5
General and administrative	0	0	0	2
Interest and other, net	0	0	0	24
Income before income taxes	12	(7)	(37)	28
Provision for income taxes	(3)	0	8	0
Total reclassifications for the period	9	(7)	(29)	28
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	0	(4)	(1)	13
Income before income taxes	0	(4)	(1)	13
Provision for income taxes	0	0	0	0
Total reclassifications for the period	$ 0	$ (4)	$ (1)	$ 13

Interest and other non-operating income, net of interest expense and other non-operating expenses.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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