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Commitments and Contingent Liabilities- Additional Information (Detail)
£ in Millions
3 Months Ended
May. 21, 2015
USD ($)
Apr. 15, 2015
GBP (£)
Mar. 19, 2015
USD ($)
Jun. 30, 2015
USD ($)
LegalMatter
Mar. 02, 2015
LegalMatter
Dec. 31, 2014
USD ($)
Jun. 18, 2014
trust
Jan. 18, 2008
USD ($)
Commitments and Contingencies Disclosure [Line Items]                
Lending commitment maturing in less than one year       $ 39,600,000,000        
Lending commitment maturing in one to five years       22,200,000,000        
Lending commitment maturing over five years       $ 190,000,000        
Maximum maturities of prearranged contract for a securities lending transaction (in days)       90 days        
Cash collateralization percentage generally required for a securities lending transaction with indemnification against broker default (percent)       102.00%        
Securities lending indemnifications, secured amount of collateral       $ 316,000,000,000   $ 316,000,000,000    
Securities lending indemnifications joint venture       66,000,000,000   64,000,000,000    
Securities Lending Indemnifications Collateral Joint Venture       70,000,000,000   67,000,000,000    
Loss contingency, aggregate range of reasonable loss       $ 440,000,000        
Bank filed a proof of claim on Jan. 18, 2008 in the Chapter 11 bankruptcy of Sentinel Management Group, Inc. (Sentinel), seeking to recover approximate amount loaned to Sentinel               $ 312,000,000
FX-related settlements     $ 714,000,000          
Loss contingency, number of MBS trusts | trust             260  
Number of lawsuits pending related to Stanford Matter (legal matters) | LegalMatter       12        
Arbitration claims related to Stanford matter pending | LegalMatter         6      
Securities Lending Matters                
Commitments and Contingencies Disclosure [Line Items]                
Number of pending lawsuits | LegalMatter       2        
Foreign Exchange Matters                
Commitments and Contingencies Disclosure [Line Items]                
Litigation settlement amount $ 180,000,000              
UK Financial Conduct Authority Matter                
Commitments and Contingencies Disclosure [Line Items]                
Litigation settlement amount | £   £ 126            
Standby letters of credit                
Commitments and Contingencies Disclosure [Line Items]                
SBLCs collateralized with cash and securities       $ 405,000,000   421,000,000    
SBLCs expiring within one year       3,100,000,000        
SBLCs expiring within one to five years       1,900,000,000        
Off balance sheet credit risk [1]       4,966,000,000   5,767,000,000    
Commercial letters of credit                
Commitments and Contingencies Disclosure [Line Items]                
Off balance sheet credit risk       324,000,000   255,000,000    
Operations                
Commitments and Contingencies Disclosure [Line Items]                
Allowance for lending related commitments       $ 95,000,000   $ 89,000,000    
DOJ and NYAG settlements                
Commitments and Contingencies Disclosure [Line Items]                
FX-related settlements     167,500,000          
Class Action Settlement                
Commitments and Contingencies Disclosure [Line Items]                
FX-related settlements     335,000,000          
DOL Settlement                
Commitments and Contingencies Disclosure [Line Items]                
FX-related settlements     14,000,000          
SEC Penalty                
Commitments and Contingencies Disclosure [Line Items]                
FX-related settlements     $ 30,000,000          
[1] Net of participations totaling $898 million at June 30, 2015 and $894 million at Dec. 31, 2014.