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Fair Value Disclosures (Details 3) (Level 2, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Fair value of impaired loans $ 161 $ 141 $ 171