Other Operating Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Expenses [Abstract]
Insurance commissions	$ 158	$ 151	$ 315	$ 300
Technology and communications	111	100	219	197
Advertising and marketing	79	77	157	149
Lease and loan administration	53	54	101	105
Property and equipment depreciation	48	41	95	80
Regulatory and licensing fees	39	22	74	48
Professional services	36	47	68	90
Vehicle remarketing and repossession	28	22	55	42
Amortization of intangible assets	6	8	13	16
Other	109	90	211	156
Total other operating expenses	$ 667	$ 612	$ 1,308	$ 1,183