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ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations $ 2,400 $ 1,100 $ 2,400
Reduction of allowance for loan and leases losses due to transfer to real estate loan portfolio 1,500 411  
Increase (decrease) in allowance due to non-provision transfer of associated with deferred interest to other assets     230
Reduction of allowance related to foreign currency translation 474 463 220
Allowance for loan losses included in other transfered to allowance for unfunded lending commitments $ 271    
Greece      
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations   204 255
Spain      
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations   177  
Honduras      
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations   29  
EMEA      
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations   $ 108  
Brazil Creditcard      
Allowance for loan losses disclosures      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations     $ 360