Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Rent expense	$ 37	$ 39	$ 37
Operating lease right-of-use asset	100	117
Operating lease liabilities	116	138
Operating lease right-of-use asset obtained in exchange for lease obligations		$ 17
2024	27
2025	24
2026	25
2027	20
2028	17
Thereafter	17
Imputed interest	$ 13
Weighted-average discount rate (as a percent)	4.30%	4.20%
Weighted average remaining lease term (in years)	5 years 3 months 18 days	6 years
Payments for operating leases	$ 49	$ 45	$ 45
Estimate of possible loss	148
Loss contingency accrual	135
Indirect tax contingency	$ 184
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets (Note 8)	Other assets (Note 8)
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Retail Finance Receivable | Texas | Geographic Concentration Risk
Loss Contingencies [Line Items]
Concentration risk (as a percent)	12.80%