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GENERAL AND ADMINISTRATIVE EXPENSES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Administrative Expense [Line Items]    
Administrative expenses $ 248 $ 256
Severance payments 3 9
Employee costs 98 153
Corporate administration    
Disclosure of Administrative Expense [Line Items]    
Administrative expenses 227 201
Operating segment administration    
Disclosure of Administrative Expense [Line Items]    
Administrative expenses $ 21 $ 55