Property and Equipment, Net - Schedule of PPE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment	$ 112
Less: Accumulated depreciation	(16)
Total property and equipment, net	96
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 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	$ 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	$ 24
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 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 capital leases - computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 10
Estimated Useful Life	5 years
Predecessor
Property, Plant and Equipment [Line Items]
Property and equipment		$ 290
Less: Accumulated depreciation		(169)
Total property and equipment, net		121
Predecessor | Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property and equipment		57
Predecessor | Capitalized software costs
Property, Plant and Equipment [Line Items]
Property and equipment		152
Predecessor | Software in development and other
Property, Plant and Equipment [Line Items]
Property and equipment		12
Predecessor | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment		19
Predecessor | Long-term capital leases - computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment		$ 50