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PROPERTY AND EQUIPMENT - Additional information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property plant and equipment    
Acquired property and equipment, not yet paid $ 441 $ 699
Impairment 15 100
Property plant and equipment pledged as security for bank borrowings 875 1,029
Interest cost capitalized $ 3 $ 5
Capitalization rate of borrowings (In percent) 8.30% 10.30%
Telecommunications equipment | Minimum    
Property plant and equipment    
Useful life (in years) P3Y  
Telecommunications equipment | Maximum    
Property plant and equipment    
Useful life (in years) P20Y  
Buildings and constructions | Minimum    
Property plant and equipment    
Useful life (in years) P10Y  
Buildings and constructions | Maximum    
Property plant and equipment    
Useful life (in years) P50Y  
Office and other equipment | Minimum    
Property plant and equipment    
Useful life (in years) P3Y  
Office and other equipment | Maximum    
Property plant and equipment    
Useful life (in years) P10Y  
Ukraine, Pakistan and Bangladesh    
Property plant and equipment    
Depreciation charges $ 74 $ 153