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SEGMENT INFORMATION - Geographical information of non-current assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Geographical information of non-current assets    
Non-current assets $ 15,113 $ 16,643
Russia    
Geographical information of non-current assets    
Non-current assets 5,969 6,116
Pakistan    
Geographical information of non-current assets    
Non-current assets 1,840 2,169
Algeria    
Geographical information of non-current assets    
Non-current assets 2,151 2,324
Bangladesh    
Geographical information of non-current assets    
Non-current assets 988 1,104
Ukraine    
Geographical information of non-current assets    
Non-current assets 552 556
Uzbekistan    
Geographical information of non-current assets    
Non-current assets 213 509
HQ    
Geographical information of non-current assets    
Non-current assets 55 38
Other    
Geographical information of non-current assets    
Non-current assets $ 3,345 $ 3,827