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Loans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Receivables were Modified and Became Classified as TDR Loans    
Total $ 52 $ 200
Commercial loans [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total    92
Commercial loans [Member] | Construction and other real estate [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total    70
Commercial loans [Member] | Business banking and middle markets enterprises [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total    22
Commercial loans [Member] | Global banking [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total      
Commercial loans [Member] | Other commercial [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total      
Consumer loans [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total 52 108
Consumer loans [Member] | Residential mortgages [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total 52 108
Consumer loans [Member] | Credit cards [Member]
   
Receivables were Modified and Became Classified as TDR Loans    
Total