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Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Total $ 5,452,406 $ 5,457,095
Interest rate contracts [Member]
   
Derivative [Line Items]    
Total 3,898,500 3,993,309
Interest rate contracts [Member] | Futures and forwards [Member]
   
Derivative [Line Items]    
Total 165,895 175,468
Interest rate contracts [Member] | Swaps [Member]
   
Derivative [Line Items]    
Total 3,631,662 3,645,085
Interest rate contracts [Member] | Options written [Member]
   
Derivative [Line Items]    
Total 47,508 85,021
Interest rate contracts [Member] | Options purchased [Member]
   
Derivative [Line Items]    
Total 53,435 87,735
Foreign exchange contracts [Member]
   
Derivative [Line Items]    
Total 1,122,370 1,024,123
Foreign exchange contracts [Member] | Options written [Member]
   
Derivative [Line Items]    
Total 111,812 82,817
Foreign exchange contracts [Member] | Options purchased [Member]
   
Derivative [Line Items]    
Total 112,903 84,835
Foreign exchange contracts [Member] | Swaps, futures and forwards [Member]
   
Derivative [Line Items]    
Total 819,858 804,278
Foreign exchange contracts [Member] | Spot [Member]
   
Derivative [Line Items]    
Total 77,797 52,193
Commodity and Equity Contract [Member]
   
Derivative [Line Items]    
Total 95,811 84,377
Commodity and Equity Contract [Member] | Options written [Member]
   
Derivative [Line Items]    
Total 18,007 21,531
Commodity and Equity Contract [Member] | Options purchased [Member]
   
Derivative [Line Items]    
Total 28,884 21,723
Commodity and Equity Contract [Member] | Swaps, futures and forwards [Member]
   
Derivative [Line Items]    
Total 48,920 41,123
Credit contracts [Member]
   
Derivative [Line Items]    
Total $ 335,725 $ 355,286