Property and Equipment, Net - Schedule of PPE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment	$ 167	$ 112
Less: Accumulated depreciation	(55)	(16)
Total property and equipment, net	112	96
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 50	32
Furniture, fixtures, and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Furniture, fixtures, and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property and equipment	$ 54	24
Capitalized software costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Capitalized software costs | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Software in development and other
Property, Plant and Equipment [Line Items]
Property and equipment	$ 31	24
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 24	22
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Long-term finance leases - computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 8	$ 10
Estimated Useful Life	5 years