Segment Reporting - Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 3,343	$ 3,156
Operating expenses	442	372
Leased vehicle expenses	1,039	855
Provision for loan losses	131	122
Interest expense	1,000	577
Equity income	41	54
Income before income taxes	771	1,284
North America Segment
Segment Reporting Information [Line Items]
Total revenue	3,049	2,930
Operating expenses	358	303
Leased vehicle expenses	1,022	842
Provision for loan losses	114	98
Interest expense	877	507
Equity income	0	0
Income before income taxes	677	1,179
International Segment
Segment Reporting Information [Line Items]
Total revenue	294	226
Operating expenses	84	69
Leased vehicle expenses	17	13
Provision for loan losses	17	24
Interest expense	123	70
Equity income	41	54
Income before income taxes	$ 94	$ 105