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Loans and Loans Held for Sale (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Loans Held For Sale            
Commercial, financial and agricultural $ 18   $ 19   $ 80  
Real estate - construction 12   35   39  
Commercial lease financing 13   12   6  
Total loans held for sale 656 511 728 479 381 426
Commercial Mortgage Backed Securities [Member]
           
Loans Held For Sale            
Real estate - mortgage 523   567   198  
Residential Mortgage [Member]
           
Loans Held For Sale            
Real estate - mortgage $ 90   $ 95   $ 58