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Fair Values of Assets and Liabilities (Details 4) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Losses recognized related to nonrecurring fair value measurements of individual assets or portfolios    
Loans$ 32$ 67$ 153$ 280
Other real estate owned8197230212
Other intangible assets    
Other assets