Segment Reporting and Geographic Information - Operations Reporting by Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 13,419	$ 13,831	$ 14,554
Operating expenses	1,648	1,490	1,564
Leased vehicle expenses	4,142	5,882	6,685
Provision for loan losses	248	881	726
Interest expense	2,546	3,023	3,641
Equity income	201	147	166
Income before income taxes	5,036	2,702	2,104
North America
Segment Reporting Information [Line Items]
Total revenue	12,503	12,851	13,318
Operating expenses	1,328	1,184	1,172
Leased vehicle expenses	4,093	5,834	6,634
Provision for loan losses	164	653	569
Interest expense	2,309	2,717	3,171
Equity income	0	0	0
Income before income taxes	4,609	2,463	1,772
International
Segment Reporting Information [Line Items]
Total revenue	916	980	1,236
Operating expenses	320	306	392
Leased vehicle expenses	49	48	51
Provision for loan losses	84	228	157
Interest expense	237	306	470
Equity income	201	147	166
Income before income taxes	$ 427	$ 239	$ 332