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
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Commercial [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk $ 7,471 $ 5,933 $ 5,854
Consumer [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk 5,828 5,406 5,264
Commercial Real Estate [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk 535 546 644
Standby Letters of Credit [Member]
     
Contract amounts of various commitments to extend credit      
Contract amount represents credit risk $ 548 $ 607 $ 477