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INVESTMENTS IN SUBSIDIARIES - Book values of material NCIs (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
LLP "KaR-Tel"    
Investments in subsidiaries    
Book values of material NCIs $ 252 $ 253
LLC "Sky Mobile"    
Investments in subsidiaries    
Book values of material NCIs 167 164
Global Telecom Holding S.A.E    
Investments in subsidiaries    
Book values of material NCIs (778) (219)
Omnium Telecom Algerie S.p.A    
Investments in subsidiaries    
Book values of material NCIs $ 1,235 $ 1,332