v3.25.2
Expected Loss to be Paid (Recovered) - Key Assumptions in Base Scenario Expected Loss First Lien RMBS (Details) - RMBS - United States
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Base Scenario | First Lien    
Schedule of Expected Losses to be Paid [Line Items]    
Percent of deferred loan balances to be recovered 50.00% 50.00%
Home Equity Line of Credit    
Schedule of Expected Losses to be Paid [Line Items]    
Initial loss severity 98.00% 98.00%
Projected future recoveries on previously charged-off loans 50.00% 50.00%
Minimum    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 0.00% 0.00%
Final CDR 0.00% 0.00%
Initial loss severity 40.00% 40.00%
Liquidation rate 20.00% 20.00%
Minimum | Home Equity Line of Credit    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 0.20% 0.00%
Final CDR 0.00% 0.00%
Liquidation rate 20.00% 20.00%
Maximum    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 8.40% 8.80%
Final CDR 0.40% 0.40%
Initial loss severity 50.00% 50.00%
Liquidation rate 50.00% 50.00%
Maximum | Home Equity Line of Credit    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 6.70% 5.60%
Final CDR 0.30% 0.30%
Liquidation rate 55.00% 55.00%
Weighted Average    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 3.20% 3.40%
Final CDR 0.20% 0.20%
Initial loss severity 43.00% 43.10%
Weighted Average | Home Equity Line of Credit    
Schedule of Expected Losses to be Paid [Line Items]    
Plateau CDR 2.60% 2.20%
Final CDR 0.10% 0.10%