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IMPAIRMENT - Sensitivity to changes in assumptions (Details)
12 Months Ended
Dec. 31, 2017
item
Sensitivity to changes in assumptions  
Budget and forecast period for impairment on goodwill (in years) 5 years
Bangladesh  
Sensitivity to changes in assumptions  
CGUs with limited headroom 82
Change in assumptions by 1%, discount rate (33.00%)
Change in assumptions by 1%, terminal growth rate (17.00%)
Uzbekistan  
Sensitivity to changes in assumptions  
CGUs with limited headroom 15
Change in assumptions by 1%, discount rate (9.00%)
Change in assumptions by 1%, average growth rate (3.00%)
Change in assumptions by 1%, average Capital Expenditure/Revenue (1.00%)
Change in assumptions by 1%, terminal growth rate (7.00%)
Georgia  
Sensitivity to changes in assumptions  
CGUs with limited headroom 9