Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities (Details)

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Commitments and Contingent Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Commercial [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 8,006 $ 5,933
Consumer [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 5,904 5,406
Commercial Real Estate [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk 610 546
Standby Letters of Credit [Member]
   
Contract amounts of various commitments to extend credit    
Contract amount represents credit risk $ 586 $ 607