Fair Value - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - Residual Interests	Sep. 30, 2026 year	Dec. 31, 2025 year	Sep. 30, 2025 year
Recovery rate on defaulted receivables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.5000	0.5000	0.5000
Recovery rate on defaulted receivables \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.5000	0.5000	0.5000
Prepayment speed
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0140	0.0140	0.0140
Prepayment speed \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0140	0.0140	0.0140
Expected cumulative lifetime losses \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0205	0.0201	0.0153
Expected cumulative lifetime losses \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0315	0.0321	0.0282
Expected cumulative lifetime losses \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0284	0.0247	0.0239
Weighted-average life (in years) \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.97	0.96	0.77
Weighted-average life (in years) \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	2.24	2.46	2.53
Weighted-average life (in years) \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	1.73	1.87	1.90
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.1500	0.1500	0.1500
Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.1500	0.1500	0.1500