Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Expenses [Abstract]
Insurance commissions	$ 161	$ 157
Technology and communications	106	108
Advertising and marketing	73	78
Property and equipment depreciation	57	47
Regulatory and licensing fees	54	35
Lease and loan administration	48	48
Vehicle remarketing and repossession	33	27
Professional services	31	32
Amortization of intangible assets	6	7
Other	108	102
Total other operating expenses	$ 677	$ 641