Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property and equipment, net
Property, Plant and Equipment [Line Items]
Equipment	$ 1,988	$ 1,819
Less accumulated depreciation and amortization	(1,085)	(980)
Property and equipment, net	903	839
Land
Property, Plant and Equipment [Line Items]
Equipment	157	131
Buildings
Property, Plant and Equipment [Line Items]
Equipment	296	230
Non-rental vehicles
Property, Plant and Equipment [Line Items]
Equipment	268	317
Machinery and equipment
Property, Plant and Equipment [Line Items]
Equipment	265	223
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Equipment	435	402
Leasehold improvements
Property, Plant and Equipment [Line Items]
Equipment	$ 567	$ 516