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Employee Benefits and Other Expenses, Expenses Not Otherwise Shown Separately In Financial Statements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Expenses Not Otherwise Shown Separately In Financial Statement [Abstract]      
Outside professional services $ 2,729 $ 2,692 $ 2,370
Contract services 1,011 1,407 1,642
Foreclosed assets 1,061 1,354 1,537
Operating Losses 2,235 1,261 1,258
Outside data processing 910 935 1,046
Postage, stationery and supplies $ 799 $ 942 $ 944