v3.26.1
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
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
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 $ 8,230 $ 6,370
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 $ 7,663 $ 5,865
Weighted average life (years) 5 years 10 months 24 days 6 years 2 months 12 days
Constant prepayment rate 14.00% 12.40%
Impact of 10% adverse change $ (61) $ (53)
Impact of 20% adverse change $ (116) $ (102)
Discount rate 7.00% 8.60%
Impact of 10% adverse change $ (207) $ (171)
Impact of 20% adverse change $ (400) $ (331)