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Loans (Details 13) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Status of Commercial Loan Portfolio    
Nonaccrual Loans $ 1,645 $ 1,828
Accruing Loans Contractually Past Due 90 days or More 46 61
Total 37,417 33,649
Construction and other real estate [Member]
   
Status of Commercial Loan Portfolio    
Total 7,977 7,860
Business banking and middle markets enterprises [Member]
   
Status of Commercial Loan Portfolio    
Total 11,256 10,225
Global banking [Member]
   
Status of Commercial Loan Portfolio    
Total 15,042 12,658
Other commercial [Member]
   
Status of Commercial Loan Portfolio    
Total 3,142 2,906
Commercial Loan [Member]
   
Status of Commercial Loan Portfolio    
Performing Loans 36,760 32,810
Nonaccrual Loans 654 825
Accruing Loans Contractually Past Due 90 days or More 3 14
Total 37,417 33,649
Commercial Loan [Member] | Construction and other real estate [Member]
   
Status of Commercial Loan Portfolio    
Performing Loans 7,502 7,244
Nonaccrual Loans 475 615
Accruing Loans Contractually Past Due 90 days or More   1
Total 7,977 7,860
Commercial Loan [Member] | Business banking and middle markets enterprises [Member]
   
Status of Commercial Loan Portfolio    
Performing Loans 11,208 10,156
Nonaccrual Loans 46 58
Accruing Loans Contractually Past Due 90 days or More 2 11
Total 11,256 10,225
Commercial Loan [Member] | Global banking [Member]
   
Status of Commercial Loan Portfolio    
Performing Loans 14,928 12,521
Nonaccrual Loans 114 137
Accruing Loans Contractually Past Due 90 days or More      
Total 15,042 12,658
Commercial Loan [Member] | Other commercial [Member]
   
Status of Commercial Loan Portfolio    
Performing Loans 3,122 2,889
Nonaccrual Loans 19 15
Accruing Loans Contractually Past Due 90 days or More 1 2
Total $ 3,142 $ 2,906