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INVESTMENTS IN SUBSIDIARIES - Equity interest held by NCIs (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
LLP "KaR-Tel"    
Investments in subsidiaries    
Equity interest held by NCIs (in percentage) 25.00% 25.00%
LLC "Sky Mobile"    
Investments in subsidiaries    
Equity interest held by NCIs (in percentage) 49.80% 49.80%
Global Telecom Holding S.A.E    
Investments in subsidiaries    
Equity interest held by NCIs (in percentage) 42.30% 48.10%
Omnium Telecom Algerie S.p.A    
Investments in subsidiaries    
Equity interest held by NCIs (in percentage) 73.70% 76.30%
Algeria | Omnium Telecom Algerie S.p.A    
Investments in subsidiaries    
Equity interest held by NCIs (in percentage)   54.40%