Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Expenses [Abstract]
Insurance commissions	$ 161	$ 161
Technology and communications	103	106
Property and equipment depreciation	63	57
Advertising and marketing	61	73
Lease and loan administration	46	48
Regulatory and licensing fees	44	54
Vehicle remarketing and repossession	33	33
Professional services	31	31
Amortization of intangible assets	3	6
Other	118	108
Total other operating expenses	$ 663	$ 677