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Loans and Asset Quality - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans to directors and executive officers and to entities in which certain of our directors have an ownership interest or direct or indirect subsidiaries of such entities $ 5 $ 3 $ 3
Loans 46,629 43,979  
Number of business days in which overdrafts are generally repaid 2 days    
Other Residential Mortgages
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subsequently defaulted number of contracts 21    
Subsequently defaulted recorded investment 6    
Wealth Management Mortgages Portfolio Segment
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan to value ratio at origination 63.00%    
Percentage of past due mortgages 1.00%    
Loans 4,142 3,781  
Wealth Management Mortgages Portfolio Segment | New York State
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations 22.00%    
Wealth Management Mortgages Portfolio Segment | California State
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations 19.00%    
Wealth Management Mortgages Portfolio Segment | Massachusetts
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations 17.00%    
Wealth Management Mortgages Portfolio Segment | Florida
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations 8.00%    
Wealth Management Mortgages Portfolio Segment | Other
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Geographic concentrations 34.00%    
Overdrafts
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 5,298 4,849  
Number of business days in which overdrafts are generally repaid 2 days    
Domestic
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 36,459 33,971  
Domestic | Other Residential Mortgages
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,632 1,923  
Purchased mortgages 497    
Purchased residential mortgages, loan to value ratio 75.00%    
Percentage of purchased residential mortgages that were at least 60 days delinquent 24.00%    
Domestic | Overdrafts
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,228 2,958 4,524
Domestic | Margin Loans
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 13,397 $ 12,760 $ 6,810
Domestic | Margin Loans | Minimum
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Required daily collateral margin 100.00% 100.00%