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Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Average Recorded Investment$ 3,005$ 3,100$ 2,990 
Interest Income Recognized6953172164
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
    
Average Recorded Investment540 524 
Interest Income Recognized15 40 
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
    
Average Recorded Investment116 121 
Interest Income Recognized  15 
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
    
Average Recorded Investment287 294 
Interest Income Recognized9 25 
Commercial Portfolio Segment | Commercial Construction
    
Average Recorded Investment190 185 
Interest Income Recognized8 19 
Commercial Portfolio Segment | Commercial Leases [Member]
    
Average Recorded Investment18   
Residential Mortgage Loans
    
Average Recorded Investment1,243 1,219 
Interest Income Recognized13 34 
Consumer Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
    
Interest Income Recognized5   
Consumer Portfolio Segment | Home Equity
    
Average Recorded Investment446 445 
Interest Income Recognized17 34 
Consumer Portfolio Segment | Credit Card
    
Average Recorded Investment95 97 
Interest Income Recognized1 3 
Consumer Portfolio Segment | Commercial Leases [Member]
    
Average Recorded Investment  22 
Consumer Portfolio Segment | Consumer Other Financing Receivable
    
Average Recorded Investment28 43 
Consumer Portfolio Segment | Automobile Loan
    
Average Recorded Investment42 40 
Interest Income Recognized$ 1 $ 2