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Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "One to Three", "Four to Five" and "Six to Nine" (Watch List) Categories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Total Loans and Leases $ 28,862.9 $ 29,504.5
1 to 3 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans and Leases 13,046.8 13,332.0
4 to 5 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans and Leases 14,836.8 15,240.4
6 to 9 Category (Watch List)
   
Financing Receivable, Recorded Investment [Line Items]    
Total Loans and Leases 979.3 932.1
Commercial
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial and Institutional 7,255.6 7,468.5
Commercial Real Estate 2,822.9 2,859.8
Lease Financing, net 1,005.6 1,035.0
Non-U.S. 1,152.7 1,192.3
Other 445.2 341.6
Total Loans and Leases 12,682.0 12,897.2
Commercial | 1 to 3 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial and Institutional 4,216.7 4,291.8
Commercial Real Estate 918.6 888.6
Lease Financing, net 623.1 647.1
Non-U.S. 443.8 542.7
Other 264.7 167.2
Total Loans and Leases 6,466.9 6,537.4
Commercial | 4 to 5 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial and Institutional 2,902.3 3,040.6
Commercial Real Estate 1,663.3 1,710.9
Lease Financing, net 377.1 382.3
Non-U.S. 708.9 646.6
Other 180.5 174.4
Total Loans and Leases 5,832.1 5,954.8
Commercial | 6 to 9 Category (Watch List)
   
Financing Receivable, Recorded Investment [Line Items]    
Commercial and Institutional 136.6 136.1
Commercial Real Estate 241.0 260.3
Lease Financing, net 5.4 5.6
Non-U.S.   3.0
Total Loans and Leases 383.0 405.0
Personal
   
Financing Receivable, Recorded Investment [Line Items]    
Residential Real Estate 10,147.9 10,375.2
Private Client 5,900.0 6,130.1
Other 133.0 102.0
Total Loans and Leases 16,180.9 16,607.3
Personal | 1 to 3 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Residential Real Estate 2,936.4 3,003.3
Private Client 3,564.4 3,741.3
Other 79.1 50.0
Total Loans and Leases 6,579.9 6,794.6
Personal | 4 to 5 Category
   
Financing Receivable, Recorded Investment [Line Items]    
Residential Real Estate 6,641.7 6,868.2
Private Client 2,309.1 2,365.4
Other 53.9 52.0
Total Loans and Leases 9,004.7 9,285.6
Personal | 6 to 9 Category (Watch List)
   
Financing Receivable, Recorded Investment [Line Items]    
Residential Real Estate 569.8 503.7
Private Client 26.5 23.4
Total Loans and Leases $ 596.3 $ 527.1