Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of net revenues	$ 559	$ 514
Sales and marketing	756	648
Product development	334	278
General and administrative	270	245
Interest and other, net	(32)	11
Income before income taxes	547	558
Provision for income taxes	(140)	477
Total reclassifications for the period	(23)	32
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	(28)	0
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	0	2
Sales and marketing	0	1
Product development	0	3
General and administrative	0	1
Interest and other, net	0	13
Income before income taxes	(28)	20
Provision for income taxes	6	0
Total reclassifications for the period	(22)	20
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	(1)	12
Income before income taxes	(1)	12
Provision for income taxes	0	0
Total reclassifications for the period	$ (1)	$ 12

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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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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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