Segment Reporting and Geographic Information - Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 14,224	$ 12,766	$ 13,419
Long-Lived Assets	30,707	32,842	38,081
Leased vehicles, net	30,582	32,701	37,900
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	12,168	11,037	11,718
Long-Lived Assets	27,397	29,411	34,452
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,056	1,729	1,701
Long-Lived Assets	$ 3,309	$ 3,431	$ 3,629