Segment Reporting - Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Finance receivables, net of fees	$ 64,970	$ 62,979
Leased vehicles, net (Note 4; Note 7 VIEs)	36,581	37,929
Total assets	116,186	113,786
North America Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	60,492	58,883
Leased vehicles, net (Note 4; Note 7 VIEs)	36,380	37,741
Total assets	108,551	106,572
International Segment
Segment Reporting Information [Line Items]
Finance receivables, net of fees	4,478	4,096
Leased vehicles, net (Note 4; Note 7 VIEs)	201	188
Total assets	$ 7,635	$ 7,214