Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Expenses [Abstract]
Insurance commissions	$ 164	$ 160	$ 486	$ 475
Technology and communications	110	109	319	328
Advertising and marketing	69	74	221	231
Property and equipment depreciation	55	51	169	146
Regulatory and licensing fees	45	45	137	119
Lease and loan administration	45	57	136	158
Professional services	36	35	106	103
Vehicle remarketing and repossession	31	30	96	85
Amortization of intangible assets	4	6	15	19
Other	96	95	310	306
Total other operating expenses	$ 655	$ 662	$ 1,995	$ 1,970