Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating Expenses [Abstract]
Insurance commissions	$ 158	$ 164	$ 474	$ 486
Technology and communications	108	110	312	319
Advertising and marketing	65	69	191	221
Property and equipment depreciation	60	55	184	169
Lease and loan administration	43	45	133	136
Regulatory and licensing fees	39	45	122	137
Professional services	38	36	105	106
Vehicle remarketing and repossession	35	31	98	96
Amortization of intangible assets	0	4	3	15
Other	106	96	322	310
Total other operating expenses	$ 652	$ 655	$ 1,944	$ 1,995