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IMPAIRMENT - Key assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Key assumptions for determining the recoverable amount      
Maturity period for an United States Treasury bond 20 years    
Percentage of equity market risk premium 6.00% 5.50% 5.50%
Russia      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 10.60% 9.70% 11.20%
Average annual revenue growth rate during forecast period (as a percent) 1.90% 2.40% 2.40%
Terminal growth rate (as a percent) 1.00% 1.00% 1.00%
Average operating margin (as a percent) 36.40% 38.60% 44.10%
Average CAPEX as a percentage of revenue (as a percent) 15.70% 15.90% 16.50%
Ukraine      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 17.10% 17.20% 18.20%
Average annual revenue growth rate during forecast period (as a percent) 3.90% 3.60% 3.90%
Terminal growth rate (as a percent) 2.00% 1.00% 3.00%
Average operating margin (as a percent) 49.90% 44.90% 44.90%
Average CAPEX as a percentage of revenue (as a percent) 15.60% 17.00% 19.10%
Algeria      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 10.70% 9.80% 11.40%
Average annual revenue growth rate during forecast period (as a percent) 1.00% (0.80%) (0.90%)
Terminal growth rate (as a percent) 3.00% 3.00% 4.00%
Average operating margin (as a percent) 46.20% 50.80% 48.70%
Average CAPEX as a percentage of revenue (as a percent) 14.80% 15.80% 16.30%
Pakistan      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 15.00% 14.30% 15.70%
Average annual revenue growth rate during forecast period (as a percent) 5.00% 7.60% 4.80%
Terminal growth rate (as a percent) 4.00% 4.00% 5.00%
Average operating margin (as a percent) 43.60% 33.30% 39.20%
Average CAPEX as a percentage of revenue (as a percent) 15.30% 14.30% 14.10%
Bangladesh      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 12.70% 11.90% 13.40%
Average annual revenue growth rate during forecast period (as a percent) 5.00% 6.40% 6.50%
Terminal growth rate (as a percent) 4.60% 4.70% 5.90%
Average operating margin (as a percent) 38.70% 44.90% 41.20%
Average CAPEX as a percentage of revenue (as a percent) 14.30% 14.60% 15.80%
Kazakhstan      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 10.80% 12.40% 12.30%
Average annual revenue growth rate during forecast period (as a percent) 3.20% 4.40% 3.50%
Terminal growth rate (as a percent) 2.40% 2.00% 3.00%
Average operating margin (as a percent) 44.50% 43.60% 52.30%
Average CAPEX as a percentage of revenue (as a percent) 17.90% 18.80% 20.30%
Kyrgyzstan      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 15.50% 14.50% 14.20%
Average annual revenue growth rate during forecast period (as a percent) (1.50%) (1.80%) 2.40%
Terminal growth rate (as a percent) 3.50% 2.50% 2.50%
Average operating margin (as a percent) 42.00% 43.90% 54.10%
Average CAPEX as a percentage of revenue (as a percent) 16.40% 17.00% 12.30%
Uzbekistan      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 15.30% 15.40% 18.40%
Average annual revenue growth rate during forecast period (as a percent) 6.90% 1.70% 1.70%
Terminal growth rate (as a percent) 6.50% 1.00% 2.00%
Average operating margin (as a percent) 42.90% 58.20% 61.20%
Average CAPEX as a percentage of revenue (as a percent) 14.10% 18.20% 16.30%
Armenia      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 13.00% 12.00% 12.90%
Average annual revenue growth rate during forecast period (as a percent) (1.00%) (2.80%) (0.70%)
Terminal growth rate (as a percent) 3.00% 1.00% 2.00%
Average operating margin (as a percent) 29.70% 37.80% 35.50%
Average CAPEX as a percentage of revenue (as a percent) 19.60% 14.10% 11.80%
Georgia      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent) 11.00% 10.30% 12.60%
Average annual revenue growth rate during forecast period (as a percent) 5.60% 6.40% 6.50%
Terminal growth rate (as a percent) 1.00% 1.00% 3.00%
Average operating margin (as a percent) 25.20% 25.70% 32.20%
Average CAPEX as a percentage of revenue (as a percent) 23.30% 17.30% 16.40%
Tajikistan      
Key assumptions for determining the recoverable amount      
Discount rate (functional currency) (as a percent)     13.50%
Average annual revenue growth rate during forecast period (as a percent)     (4.20%)
Terminal growth rate (as a percent)     2.00%
Average operating margin (as a percent)     42.40%
Average CAPEX as a percentage of revenue (as a percent)     13.60%