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Loans - Components of Loans (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial $ 42,568 $ 33,649  
Total consumer 18,884 18,218  
Total 61,452 51,867 49,600
Construction and Other Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial 7,920 7,860  
Business Banking and Middle Markets Enterprises [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial 12,497 10,225  
Global Banking [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial 19,011 12,658  
Other Commercial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial 3,140 2,906  
Home Equity Mortgages [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total consumer 2,387 2,563  
Other Residential Mortgages [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total consumer 15,086 14,113  
Credit Card Receivables [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total consumer 796 828  
Other Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total consumer $ 615 $ 714