Segment Reporting and Geographic Information - Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 15,875	$ 14,224	$ 12,766
Long-Lived Assets	31,693	30,707	32,842
Leased vehicles, net	31,586	30,582	32,700
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	13,608	12,168	11,037
Long-Lived Assets	28,129	27,397	29,411
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,267	2,056	1,729
Long-Lived Assets	3,563	$ 3,309	$ 3,431
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 3,200