Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Rent expense	$ 39	$ 37	$ 39
Operating lease right-of-use asset	90	100
Operating lease liabilities	105	$ 116
Operating lease right-of-use asset obtained in exchange for lease obligations	17		17
2025	26
2026	27
2027	22
2028	20
2029	17
Thereafter	5
Imputed interest	$ 12
Weighted-average discount rate (as a percent)	4.70%	4.30%
Weighted average remaining lease term (in years)	4 years 8 months 12 days	5 years 3 months 18 days
Payments for operating leases	$ 46	$ 49	$ 45
Amount of lease agreements not yet commenced	44
Estimate of possible loss	29
Indirect tax contingency	$ 159
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)	15.00%