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Fair Value of Financial Assets and Liabilities - Quantitative Information About Significant Unobservable Inputs for Senior Notes and Residual Trust Certificated (Details) - Senior Notes and Residual Trust Certificates
Jun. 30, 2023
Jun. 30, 2022
Minimum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0572 0.0368
Minimum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0125 0.0061
Minimum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0590 0.0525
Maximum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.2984 0.2250
Maximum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.1496 0.1095
Maximum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.2990 0.3500
Weighted Average (3) | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0730 0.0537
Weighted Average (3) | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0302 0.0265
Weighted Average (3) | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.1810 0.1848