Segment Reporting and Geographic Information - Operations Reporting by Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 14,224	$ 12,766	$ 13,419
Operating expenses	1,818	1,662	1,648
Leased vehicle expenses	4,047	3,668	4,142
Provision for loan losses	826	654	248
Interest expense	4,685	2,881	2,546
Equity income	138	173	201
Income before income taxes	2,985	4,076	5,036
North America
Segment Reporting Information [Line Items]
Total revenue	12,879	11,777	12,503
Operating expenses	1,450	1,330	1,328
Leased vehicle expenses	3,972	3,613	4,093
Provision for loan losses	682	537	164
Interest expense	4,109	2,526	2,309
Equity income	0	0	0
Income before income taxes	2,666	3,771	4,609
International
Segment Reporting Information [Line Items]
Total revenue	1,345	989	916
Operating expenses	368	332	320
Leased vehicle expenses	76	54	49
Provision for loan losses	144	116	84
Interest expense	576	355	237
Equity income	138	173	201
Income before income taxes	$ 320	$ 305	$ 427