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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Significant joint ventures (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
VIP-CKH Luxembourg S.a.r.l    
Investments in associates and joint ventures    
Investment in joint ventures (as a percent) 50.00% 50.00%
VIP CKH Ireland Limited    
Investments in associates and joint ventures    
Investment in joint ventures (as a percent) 50.00% 50.00%
Euroset    
Investments in associates and joint ventures    
Investment in joint ventures (as a percent) 50.00% 50.00%