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Loans and asset quality- Allowance for Credit Losses Activity (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 50,307   $ 46,629  
Domestic
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 36,362   36,459  
Overdrafts
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 5,526   5,298  
Overdrafts | Domestic
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 1,762 2,772 2,228 2,750
Margin loans
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 14,434   13,397  
Margin loans | Domestic
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 14,434 13,242 13,397 13,462
Other | Domestic
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 657 $ 644 $ 639 $ 599