Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 4,521	$ 3,898
Less: accumulated depreciation	(2,833)	(2,552)
Projects in progress	510	531
Property and equipment, net	2,198	1,877
Capitalized software development
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	2,947	2,643
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	643	597
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	114	94
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	688	435
Land
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 129	$ 129

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 of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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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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