Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Operating Expenses [Abstract]
Insurance commissions	$ 155	$ 161	$ 316	$ 322
Technology and communications	101	103	204	209
Advertising and marketing	65	79	126	152
Property and equipment depreciation	61	57	124	114
Lease and loan administration	44	43	90	91
Regulatory and licensing fees	39	38	83	92
Professional services	36	39	67	70
Vehicle remarketing and repossession	30	32	63	65
Amortization of intangible assets	0	5	3	11
Other	98	106	216	214
Total other operating expenses	$ 629	$ 663	$ 1,292	$ 1,340