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Fair Values of Assets and Liabilities (Details 7) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financial Assets    
Cash and due from banks $ 15,403 $ 13,962
Investment securities held-to-maturity 34,635 18,877
Loans 211,516 205,082
Financial Liabilities    
Deposits 241,316 230,885
Short-term borrowings 30,684 30,468
Long-term debt 28,821 31,953
Carrying Amount [Member]
   
Financial Assets    
Cash and due from banks 15,403 13,962
Federal funds sold and securities purchased under resale agreements 121 64
Investment securities held-to-maturity 34,635 18,877
Mortgages held for sale 0 3
Other loans held for sale 34 228
Loans 211,516 205,082
Other financial instruments 6,443 6,095
Financial Liabilities    
Deposits 241,316 230,885
Short-term borrowings 30,684 30,468
Long-term debt 28,821 31,953
Fair Value [Member]
   
Financial Assets    
Cash and due from banks 15,403 13,962
Federal funds sold and securities purchased under resale agreements 121 64
Investment securities held-to-maturity 35,081 19,216
Mortgages held for sale 0 3
Other loans held for sale 34 228
Loans 212,973 206,646
Other financial instruments 6,492 6,140
Financial Liabilities    
Deposits 241,556 231,184
Short-term borrowings 30,644 30,448
Long-term debt 29,511 32,664
Fair Value [Member] | Level 1 [Member]
   
Financial Assets    
Cash and due from banks 15,403  
Federal funds sold and securities purchased under resale agreements 0  
Investment securities held-to-maturity 2,443  
Mortgages held for sale 0  
Other financial instruments 0  
Fair Value [Member] | Level 2 [Member]
   
Financial Assets    
Cash and due from banks 0  
Federal funds sold and securities purchased under resale agreements 121  
Investment securities held-to-maturity 32,549  
Mortgages held for sale 0  
Other financial instruments 1,268  
Financial Liabilities    
Deposits 241,556  
Short-term borrowings 30,644  
Long-term debt 29,511  
Fair Value [Member] | Level 3 [Member]
   
Financial Assets    
Cash and due from banks 0  
Federal funds sold and securities purchased under resale agreements 0  
Investment securities held-to-maturity 89  
Mortgages held for sale 0  
Other loans held for sale 34  
Loans 212,973  
Other financial instruments $ 5,224