Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Expenses [Abstract]
Insurance commissions	$ 157	$ 149
Technology and communications	108	97
Advertising and marketing	78	72
Lease and loan administration	48	51
Property and equipment depreciation	47	39
Regulatory and licensing fees	35	26
Professional services	32	43
Vehicle remarketing and repossession	27	20
Amortization of intangible assets	7	8
Other	102	66
Total other operating expenses	$ 641	$ 571