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Fair Values of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Financial Assets        
Cash and due from banks $ 12,636 $ 8,477 $ 6,618 $ 8,252
Investment securities held-to-maturity 41,995 [1] 38,920 [1]    
Financial Liabilities        
Deposits 276,262 262,123    
Long-term debt 25,891 20,049    
Carrying Amount [Member]
       
Financial Assets        
Cash and due from banks 12,636 8,477    
Federal funds sold and securities purchased under resale agreements 271 163    
Investment securities held-to-maturity 41,995 38,920    
Loans held for sale 24 5    
Loans 239,640 230,857    
Other financial instruments 2,247 2,443    
Financial Liabilities        
Deposits 276,262 262,123    
Short-term borrowings 28,429 26,945    
Long-term debt 25,891 20,049    
Other Liabilities 1,294 1,263    
Fair Value [Member]
       
Financial Assets        
Cash and due from banks 12,636 8,477    
Federal funds sold and securities purchased under resale agreements 271 163    
Investment securities held-to-maturity 41,964 38,368    
Loans held for sale 24 5    
Loans 242,067 231,480    
Other financial instruments 2,257 2,463    
Financial Liabilities        
Deposits 276,150 262,200    
Short-term borrowings 28,296 26,863    
Long-term debt 26,331 20,391    
Other Liabilities 1,294 1,263    
Fair Value [Member] | Level 1 [Member]
       
Financial Assets        
Cash and due from banks 12,636 8,477    
Federal funds sold and securities purchased under resale agreements          
Investment securities held-to-maturity 1,413 2,589    
Loans held for sale          
Loans          
Other financial instruments          
Financial Liabilities        
Deposits          
Short-term borrowings          
Long-term debt          
Other Liabilities          
Fair Value [Member] | Level 2 [Member]
       
Financial Assets        
Cash and due from banks          
Federal funds sold and securities purchased under resale agreements 271 163    
Investment securities held-to-maturity 40,454 35,678    
Loans held for sale          
Loans          
Other financial instruments 946 1,080    
Financial Liabilities        
Deposits 276,150 262,200    
Short-term borrowings 28,296 26,863    
Long-term debt 26,331 20,391    
Other Liabilities          
Fair Value [Member] | Level 3 [Member]
       
Financial Assets        
Cash and due from banks          
Federal funds sold and securities purchased under resale agreements          
Investment securities held-to-maturity 97 101    
Loans held for sale 24 5    
Loans 242,067 231,480    
Other financial instruments 1,311 1,383    
Financial Liabilities        
Deposits          
Short-term borrowings          
Long-term debt          
Other Liabilities $ 1,294 $ 1,263    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.