Segment Reporting and Geographic Information - Operations Reporting by Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Finance receivables	$ 93,510	$ 84,637
Leased vehicles, net	31,586	30,582	$ 32,700
Assets from reportable segments	140,897	131,933
Total assets	141,030	132,011
Other Operating Segment
Segment Reporting Information [Line Items]
Other assets	134	77
North America
Segment Reporting Information [Line Items]
Finance receivables	87,084	78,148
Leased vehicles, net	31,236	30,227
Assets from reportable segments	131,643	122,051
International
Segment Reporting Information [Line Items]
Finance receivables	6,426	6,489
Leased vehicles, net	350	356
Assets from reportable segments	$ 9,254	$ 9,883