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Derivative Financial Instruments - Fair Value of Derivative Instruments Held For Other Purpose (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ (85,543) $ (86,546)
Other assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,566 1,021
Other assets [Member] | Interest rate contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 986 957
Other assets [Member] | Foreign exchange contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 33 11
Other assets [Member] | Equity contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 546 51
Other assets [Member] | Credit contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets 1 2
Interest taxes and other liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 256 214
Interest taxes and other liabilities [Member] | Interest rate contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 113 106
Interest taxes and other liabilities [Member] | Foreign exchange contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 31 13
Interest taxes and other liabilities [Member] | Equity contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 107 87
Interest taxes and other liabilities [Member] | Credit contracts [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 5 $ 8