Segment Reporting - Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Finance receivables, net of fees	$ 76,178	$ 74,514
Leased vehicles, net (Note 4; Note 7)	31,848	32,701
Total assets	123,565	122,545
North America Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	70,940	69,705
Leased vehicles, net (Note 4; Note 7)	31,566	32,454
Total assets	115,050	114,612
International Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	5,238	4,809
Leased vehicles, net (Note 4; Note 7)	282	247
Total assets	$ 8,515	$ 7,934