Segment Reporting - Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Finance receivables, net of fees	$ 66,847	$ 62,979
Leased vehicles, net (Note 4; Note 7 VIEs)	35,307	37,929
Total assets	117,778	113,786
North America Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	62,545	58,883
Leased vehicles, net (Note 4; Note 7 VIEs)	35,099	37,741
Total assets	110,396	106,572
International Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	4,302	4,096
Leased vehicles, net (Note 4; Note 7 VIEs)	208	188
Total assets	$ 7,382	$ 7,214