Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 675	$ 626
Less: accumulated depreciation	(460)	(386)
Total	215	240
Capitalized Website Development
Property Plant And Equipment [Line Items]
Property and equipment, gross	416	371
Total	97	108
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	48	49
Computer Equipment and Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	77	71
Furniture, Office Equipment and Other
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 20	$ 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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