Collateralized Agreements and Financings - Other Secured Financings by Maturity Date (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Secured Financings By Maturity Period [Line Items]
Other secured financings (short-term)	$ 15,188	$ 14,233
Total other secured financings (long-term)	7,290	10,520
Total other secured financings	22,478	$ 24,753
Other secured financings (long-term) [Member]
Other Secured Financings By Maturity Period [Line Items]
2017	1,080
2018	3,394
2019	697
2020	1,185
2021	249
2022 - thereafter	$ 685