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Derivative Financial Instruments - Fair Value of Derivative Instruments Held For Trading Purposes (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ (85,543) $ (86,546)
Trading assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 98,237 93,768
Trading assets [Member] | Interest rate contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 74,031 60,719
Trading assets [Member] | Foreign exchange contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 14,147 15,654
Trading assets [Member] | Equity contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,070 1,165
Trading assets [Member] | Precious metals contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 771 1,842
Trading assets [Member] | Credit contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 8,218 14,388
Trading liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 99,205 93,390
Trading liabilities [Member] | Interest rate contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 74,065 61,280
Trading liabilities [Member] | Foreign exchange contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 13,677 15,413
Trading liabilities [Member] | Equity contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 1,067 1,164
Trading liabilities [Member] | Precious metals contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 1,910 1,248
Trading liabilities [Member] | Credit contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 8,486 $ 14,285