Other Operating Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Expenses [Abstract]
Insurance commissions	$ 636	$ 610	$ 562
Technology and communications	436	406	345
Advertising and marketing	308	366	241
Lease and loan administration	210	201	222
Regulatory and licensing fees	205	119	75
Property and equipment depreciation	196	165	153
Professional services	145	173	146
Vehicle remarketing and repossession	116	91	74
Amortization of intangible assets	25	31	20
Other	414	345	368
Total other operating expenses	$ 2,691	$ 2,507	$ 2,206