Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,469	$ 6,344
Accumulated depreciation	(4,959)	(4,747)
Property and equipment, net	1,510	1,597
Depreciation expense	628	626	$ 612
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,029	4,933
Land and buildings, including building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	740	713
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	421	399
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	175	169
Construction in progress and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 104	$ 130

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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