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
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Commercial [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk $ 8,402 $ 8,006 $ 6,233
Consumer [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk 6,083 5,904 5,552
Commercial Real Estate [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk 564 610 554
Standby Letters of Credit [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk $ 530 $ 586 $ 580