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EARNINGS PER SHARE - Discontinued operations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
(Loss)/profit for the period attributable to the owners of the parent   $ 2,708 $ 262
Denominator:      
Weighted average common shares outstanding for basic earnings per share (in millions) 1,749 1,749 1,748
Effect of dilutive securities: Employee stock options (in millions)     1
Denominator for diluted earnings per share (in millions) 1,749 1,749 1,749
Basic (loss) / earnings per share $ 0.00 $ 1.55 $ 0.15
Diluted (loss) / earnings per share $ 0.00 $ 1.55 $ 0.15