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Fair Values of Assets and Liabilities (Details 4) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Losses recognized related to nonrecurring fair value measurements of individual assets or portfolios        
Loans $ 106 $ 92 $ 121 $ 213
Other real estate owned 62 65 149 115
Other intangible assets 0 0 0 0
Other assets $ 0 $ 0 $ 0 $ 0