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Securitization Activities - Weighted Average Key Economic Assumptions Used in Measuring Fair Value of Firm's Retained Interests and Sensitivity of This Fair Value to Immediate Adverse Changes (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Retained interest $ 7,190 $ 5,780
Mortgage-backed retained interests    
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Retained interest $ 6,703 $ 5,292
Weighted average life (years) 5 years 1 month 6 days 6 years 1 month 6 days
Constant prepayment rate 15.00% 10.00%
Impact of 10% adverse change $ (55) $ (57)
Impact of 20% adverse change $ (107) $ (110)
Discount rate 7.30% 7.80%
Impact of 10% adverse change $ (164) $ (136)
Impact of 20% adverse change $ (320) $ (281)