XML 124 R110.htm IDEA: XBRL DOCUMENT v3.7.0.1
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
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
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 $ 1,500 $ 1,580
Mortgage-Backed [Member]    
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 $ 1,449 $ 1,519
Weighted average life (years) 7 years 6 months 7 years 6 months
Constant prepayment rate 8.60% 8.10%
Impact of 10% adverse change $ (15) $ (14)
Impact of 20% adverse change $ (27) $ (28)
Discount rate 5.20% 5.30%
Impact of 10% adverse change $ (36) $ (37)
Impact of 20% adverse change $ (71) $ (71)