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RISKS, COMMITMENTS, CONTINGENCIES AND UNCERTAINTIES - Capital commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Capital commitments    
Total commitments $ 861 $ 1,187
Less than 1 year    
Capital commitments    
Capital commitment, Property and equipment 555 689
Capital commitment, Intangible assets 40 32
Between 1 and 5 years    
Capital commitments    
Capital commitment, Property and equipment 262 448
Capital commitment, Intangible assets $ 4 $ 18