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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, 2023
Dec. 31, 2022
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]    
Fair value of retained interests $ 5,360 $ 5,030
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]    
Fair value of retained interests $ 4,865 $ 4,644
Weighted average life (years) 6 years 3 months 18 days 6 years 7 months 6 days
Constant prepayment rate 9.30% 7.70%
Impact of 10% adverse change $ (47) $ (27)
Impact of 20% adverse change $ (91) $ (48)
Discount rate 8.30% 9.50%
Impact of 10% adverse change $ (135) $ (138)
Impact of 20% adverse change $ (265) $ (266)