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IMPAIRMENT - Carrying amount of goodwill and cash-generating units (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period $ 4,696 $ 4,223
Impairment (51) (78)
Reclassification of Deodar as held for sale (237)  
Acquisition   201
Translation adjustment (14) 350
Goodwill at end of period $ 4,394 4,696
Business plans coverage period (in years) 5 years  
Russia    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period $ 2,312 1,924
Translation adjustment 122 388
Goodwill at end of period 2,434 2,312
Algeria    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 1,393 1,435
Translation adjustment (53) (42)
Goodwill at end of period 1,340 1,393
Pakistan    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 497 295
Reclassification of Deodar as held for sale (237)  
Acquisition   201
Translation adjustment (16) 1
Goodwill at end of period 244 497
Kazakhstan    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 176 173
Translation adjustment 1 3
Goodwill at end of period 177 176
Kyrgyzstan    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 145 177
Impairment (17) (49)
Translation adjustment   17
Goodwill at end of period 128 145
Uzbekistan    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 114 131
Translation adjustment (68) (17)
Goodwill at end of period 46 114
Armenia    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period 59 59
Impairment (34)  
Goodwill at end of period $ 25 59
Tajikistan    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period   21
Impairment   (21)
Others    
Carrying amount of goodwill and cash-generating units    
Goodwill at beginning of period   8
Impairment   $ (8)