Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 626	$ 589
Less: accumulated depreciation	(386)	(319)
Total	240	270
Capitalized Software and Website Development
Property Plant And Equipment [Line Items]
Property and equipment, gross	371	335
Total	108	115
Finance Lease Right-of-Use Asset
Property Plant And Equipment [Line Items]
Property and equipment, gross	114	114
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	49	49
Computer Equipment and Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	71	70
Furniture, Office Equipment and Other
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 21	$ 21

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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