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DERIVATIVES (Details 2) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Gross and net fair values of outstanding derivatives (in millions)    
Total gross and net fair value, asset $ 66 $ 24
Total gross and net fair value, liability (4)  
Commodity Contracts | Other current assets.    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 66 $ 24
Commodity Contracts | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross $ (4)