Fair Value - Fair Value Measurement Inputs and Valuation Techniques (Details) - Residual Interests	Sep. 30, 2025	Jul. 30, 2025
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
Prepayment speed
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0140	0.0140
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.1500	0.1500
Minimum | Expected cumulative lifetime losses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0153	0.0156
Minimum | Weighted-average life (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.77	0.85
Maximum | Expected cumulative lifetime losses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0282	0.0265
Maximum | Weighted-average life (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	2.53	2.49
Weighted Average | 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
Weighted Average | Prepayment speed
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0140	0.0140
Weighted Average | Expected cumulative lifetime losses
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.0239	0.0233
Weighted Average | Weighted-average life (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	1.90	1.91
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities, available-for-sale, measurement input	0.1500	0.1500