Segment Reporting - Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Finance receivables	$ 85,771	$ 84,637
Leased vehicles, net	30,106	30,582
Total assets	133,221	132,011
North America
Segment Reporting Information [Line Items]
Finance receivables	79,091	78,148
Leased vehicles, net	29,731	30,227
Total assets	123,183	122,128
International
Segment Reporting Information [Line Items]
Finance receivables	6,680	6,489
Leased vehicles, net	375	356
Total assets	$ 10,038	$ 9,883