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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income taxes          
Netherlands statutory tax rate 25.00% 25.00% 25.00% 25.00%  
Effective tax rate 81.30% (60.20%) 76.30% 185.60%  
Deferred tax assets $ 200   $ 200   $ 272
Impairment of joint ventures and associates       $ 110  
Adjustment to net deferred tax liability       $ 124  
Effective tax rate for non-deductible expenses   50.80%   59.50%  
Higher Nominal Rate, Non-deductible Expenses and Income Tax Losses          
Income taxes          
Deferred tax assets $ 0 $ 0 $ 0 $ 0