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SEGMENT INFORMATION - Reportable Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEGMENT INFORMATION      
Operating revenue $ 9,474 $ 8,885 $ 9,606
Adjusted EBITDA 3,587 3,232 2,875
Capital expenditures 1,791 1,741 2,034
Reportable segments      
SEGMENT INFORMATION      
Operating revenue 9,474 8,885 9,606
Russia      
SEGMENT INFORMATION      
Operating revenue 4,729 4,097 4,583
Adjusted EBITDA 1,788 1,574 1,825
Capital expenditures 686 663 910
Russia | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 4,698 4,059 4,528
Russia | Inter-segment      
SEGMENT INFORMATION      
Operating revenue 31 38 55
Pakistan      
SEGMENT INFORMATION      
Operating revenue 1,525 1,295 1,014
Adjusted EBITDA 703 507 409
Capital expenditures 535 215 238
Pakistan | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 1,525 1,293 1,014
Pakistan | Inter-segment      
SEGMENT INFORMATION      
Operating revenue   2  
Algeria      
SEGMENT INFORMATION      
Operating revenue 915 1,040 1,273
Adjusted EBITDA 426 547 684
Capital expenditures 129 201 189
Algeria | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 914 1,040 1,273
Algeria | Inter-segment      
SEGMENT INFORMATION      
Operating revenue 1    
Bangladesh      
SEGMENT INFORMATION      
Operating revenue 574 621 604
Adjusted EBITDA 233 267 242
Capital expenditures 101 137 134
Bangladesh | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 574 621 604
Ukraine      
SEGMENT INFORMATION      
Operating revenue 622 586 622
Adjusted EBITDA 347 306 292
Capital expenditures 114 106 299
Ukraine | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 600 566 592
Ukraine | Inter-segment      
SEGMENT INFORMATION      
Operating revenue 22 20 30
Uzbekistan      
SEGMENT INFORMATION      
Operating revenue 513 663 711
Adjusted EBITDA 261 395 437
Capital expenditures 63 174 55
Uzbekistan | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 513 662 710
Uzbekistan | Inter-segment      
SEGMENT INFORMATION      
Operating revenue   1 1
HQ      
SEGMENT INFORMATION      
Operating revenue   10  
Adjusted EBITDA (325) (421) (1,291)
Capital expenditures 28 27 16
HQ | Reportable segments      
SEGMENT INFORMATION      
Operating revenue   10  
Other      
SEGMENT INFORMATION      
Operating revenue 596 573 799
Adjusted EBITDA 154 57 277
Capital expenditures 135 218 193
Other | Reportable segments      
SEGMENT INFORMATION      
Operating revenue 650 634 885
Other | Inter-segment      
SEGMENT INFORMATION      
Operating revenue $ (54) $ (61) $ (86)