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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Italy joint venture - Segment information (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
Italy Joint Venture Segment      
Segment information      
Operating revenue 6,913 1,250  
Adjusted EBITDA 2,131 482  
Capital expenditures 1,434 584  
Reportable segments      
Segment information      
Operating revenue 9,474 8,885 $ 9,606
Reportable segments | Italy Joint Venture Segment      
Segment information      
Operating revenue 6,912 $ 1,250  
Inter-segment | Italy Joint Venture Segment      
Segment information      
Operating revenue $ 1