Amount of expense for amortization of capitalized computer software costs.

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Amount of cost capitalized for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The Company and Summary of Significant Accounting Policies - Internal Use Software and Platform Development Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capitalized in product development	$ 129	$ 137
Amortization of previously capitalized software	$ 139	$ 150	$ 160
Internal Use Software and Platform Development Costs \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Internal Use Software and Platform Development Costs \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years