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Fair Values of Assets and Liabilities (Details 3) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Adjusted carrying values for assets measured at fair value on a nonrecurring basis    
Loans $ 168 $ 405
Other intangible assets 0 1
Other assets 310 825
Level 1 [Member]
   
Adjusted carrying values for assets measured at fair value on a nonrecurring basis    
Loans 0 0
Other intangible assets 0 0
Other assets 0 0
Level 2 [Member]
   
Adjusted carrying values for assets measured at fair value on a nonrecurring basis    
Loans 0 404
Other intangible assets 0 0
Other assets 0 816
Level 3 [Member]
   
Adjusted carrying values for assets measured at fair value on a nonrecurring basis    
Loans 168 1
Other intangible assets 0 1
Other assets $ 310 $ 9