Property and Equipment, net - Schedule of Property and Equipment Net (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,033	$ 2,097
Less: Accumulated depreciation and amortization	(1,439)	(1,560)
Property and equipment, net	594	537
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	59	50
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	507	525
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	906	932
Furniture, fixtures & equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	382	426
Projects in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89	84
Buses and support vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 90	$ 80