Property and Equipment, Net - Property and Equipment, Net of Accumulated Depreciation and Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 154	$ 75
Less: accumulated depreciation and amortization	(46)	(37)
Property and equipment, net	$ 108	38
Computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Total property and equipment	$ 16	15
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Total property and equipment	$ 11	13
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 21	22
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	8 years
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 106	$ 25
Capitalized internal-use software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Capitalized internal-use software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years