Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,099	$ 5,945
Accumulated depreciation	(4,863)	(4,653)
Property and equipment, net	1,236	1,292
Depreciation expense	485	560	$ 572
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,747	4,585
Land and buildings, including building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	779	744
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	356	320
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	140	141
Construction in progress and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 77	$ 155

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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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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