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INVESTMENTS IN SUBSIDIARIES - Profit / (loss) allocated to material NCIs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments in subsidiaries      
Profit/(loss) attributable to material NCIs $ (13) $ 92 $ 102
LLP "KaR-Tel"      
Investments in subsidiaries      
Profit/(loss) attributable to material NCIs 8 10  
LLC "Sky Mobile"      
Investments in subsidiaries      
Profit/(loss) attributable to material NCIs 3 (21)  
Global Telecom Holding S.A.E      
Investments in subsidiaries      
Profit/(loss) attributable to material NCIs (40) 116  
Omnium Telecom Algerie S.p.A      
Investments in subsidiaries      
Profit/(loss) attributable to material NCIs $ 100 $ 141