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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH AND CASH EQUIVALENTS        
Cash at bank and on hand $ 840 $ 1,707    
Short-term deposits with original maturity of less than three months 464 1,235    
Total cash and cash equivalents 1,304 2,942 $ 3,614 $ 6,342
Restricted cash 0      
Investments in money market funds $ 91 578    
Uzbekistan        
CASH AND CASH EQUIVALENTS        
Restricted cash   347    
Short and long term restricted deposits at financial institutions   372    
Ukraine        
CASH AND CASH EQUIVALENTS        
Restricted cash   $ 3