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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Not primary beneficiary
   
Variable interest entity    
VIEs maximum exposures to loss $ 1,776 $ 1,183
Primary beneficiary
   
Variable interest entity    
VIEs maximum exposures to loss $ 234 $ 199