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ALLOWANCE FOR CREDIT LOSSES (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Allowance for loan losses disclosures    
Gross credit losses $ (3,551) $ (4,771)
Net specific reserve builds (releases) 358 933
Other, net 1,062 (32)
U.S. loan portfolios
   
Allowance for loan losses disclosures    
Other, net 855 145
Greece loan portfolios
   
Allowance for loan losses disclosures    
Other, net 165  
Anticipated forgiveness of principal in connection with national mortgage settlement
   
Allowance for loan losses disclosures    
Gross credit losses   (370)
Net specific reserve builds (releases)   $ 350