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Loans And Leases (Net Loans) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 10,053 $ 11,957    
Allowance for loan losses (22) (100) (79) (18)
Loans and leases, net of allowance for loan losses 10,031 11,857    
U.S. [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investment funds 5,592 5,316    
Commercial and financial 563 540    
Commercial real estate 460 764    
Purchased receivables 563 728    
Lease financing 397 417    
Non-U.S. [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investment funds 796 1,478    
Commercial and financial 453 190    
Purchased receivables 372 1,471    
Lease financing 857 1,053    
Institutional [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 9,593 11,193    
Allowance for loan losses (22) (31)    
Commercial Real Estate [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 460 764    
Allowance for loan losses   $ (69)