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INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period $ 4,394  
Currency translation (255)  
Goodwill at end of period 4,139  
Goodwill impairment 0 $ 0
Russia    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 2,434  
Currency translation (199)  
Goodwill at end of period 2,235  
Algeria    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 1,340  
Currency translation (32)  
Goodwill at end of period 1,308  
Pakistan    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 244  
Currency translation (22)  
Goodwill at end of period 222  
Kazakhstan    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 177  
Currency translation (5)  
Goodwill at end of period 172  
Kyrgyzstan    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 128  
Currency translation 2  
Goodwill at end of period 130  
Uzbekistan    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 46  
Currency translation 1  
Goodwill at end of period 47  
Armenia    
Movement in goodwill for the Group, per cash generating unit    
Goodwill at beginning of period 25  
Goodwill at end of period $ 25