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Loans and Allowance for Credit Losses (Details 2) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Changes in the accretable balance for purchased impaired loans    
Balance at beginning of period$ 3,015$ 2,749$ 2,890$ 2,845
Purchases  100 
Accretion(110)(103)(337)(308)
Disposals(43)(2)(47)(20)
Reclassifications (to)/from nonaccretable difference(170)156117316
Other(7)(4)(38)(37)
Balance at end of period$ 2,685$ 2,796$ 2,685$ 2,796