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Loans (Details 9) (Commercial loans [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Modifications [Line Items]    
Impaired commercial loans as TDR $ 473 $ 473
Construction and other real estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Impaired commercial loans as TDR 353 342
Business banking and middle markets enterprises [Member]
   
Financing Receivable, Modifications [Line Items]    
Impaired commercial loans as TDR 86 94
Global banking [Member]
   
Financing Receivable, Modifications [Line Items]    
Impaired commercial loans as TDR      
Other commercial [Member]
   
Financing Receivable, Modifications [Line Items]    
Impaired commercial loans as TDR $ 34 $ 37