Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingent Liabilities (Details)

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Commitments and Contingent Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Commercial [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 9,002 $ 8,006
Consumer [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 6,145 5,904
Commercial Real Estate [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 746 610
Standby Letters of Credit [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 520 $ 586