Property and Equipment, Net - Additional Information (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, net	$ 270	$ 253	[1]
Depreciation of property and equipment, including amortization of internal-use software and website development	93	82		$ 79
Capitalized Software and Website Development
Property Plant And Equipment [Line Items]
Property and equipment, net	115	99
Capitalized computer software and website development costs	79	63		65
Depreciation of property and equipment, including amortization of internal-use software and website development	$ 63	$ 59		$ 54

[1] Refer to the below discussion regarding the transition accounting for operating and finance leases upon adoption of ASC 842.