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Variable Interest Entities - Nonconsolidated Variable Interest Entities (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]    
Assets in VIE $ 76,010 $ 90,145
Maximum Exposure to Loss in Nonconsolidated VIEs 14,905 15,751
Commitments and guarantees and derivative transactions with VIEs to which the firm transferred assets 1,500 1,520
CDOs Backed by Mortgage Obligations [Member]    
Variable Interest Entity [Line Items]    
Assets in VIE 3,380 4,080
Maximum Exposure to Loss in Nonconsolidated VIEs $ 339 $ 502