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Loans (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Commercial and Consumer Loans      
Total commercial $ 37,417 $ 33,649  
Total consumer 18,647 18,218  
Total loans 56,064 [1] 51,867 [1] 49,612
Construction and other real estate [Member]
     
Commercial and Consumer Loans      
Total commercial 7,977 7,860  
Business banking and middle markets enterprises [Member]
     
Commercial and Consumer Loans      
Total commercial 11,256 10,225  
Global banking [Member]
     
Commercial and Consumer Loans      
Total commercial 15,042 12,658  
Other commercial [Member]
     
Commercial and Consumer Loans      
Total commercial 3,142 2,906  
Home equity mortgages [Member]
     
Commercial and Consumer Loans      
Total consumer 2,455 2,563  
Other residential mortgages [Member]
     
Commercial and Consumer Loans      
Total consumer 14,758 14,113  
Credit cards [Member]
     
Commercial and Consumer Loans      
Total consumer 783 828  
Other consumer [Member]
     
Commercial and Consumer Loans      
Total consumer $ 651 $ 714  
[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.