Segment Reporting - Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Finance receivables, net of fees	$ 79,005	$ 74,514
Leased vehicles, net (Note 4; Note 7)	31,560	32,701
Total assets	128,173	122,545
North America Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	73,283	69,705
Leased vehicles, net (Note 4; Note 7)	31,245	32,454
Total assets	119,144	114,612
International Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	5,722	4,809
Leased vehicles, net (Note 4; Note 7)	315	247
Total assets	$ 9,029	$ 7,934