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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Italy joint venture - Income statement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income statement and statement of comprehensive income      
Operating revenue $ 9,474 $ 8,885 $ 9,606
Operating expenses (7,968) (7,801) (9,082)
Income tax expense (397) (615) (712)
(Loss) / profit for the period (496) 2,420 (553)
Other comprehensive loss (657) (108) (1,792)
Total comprehensive (loss) / income for the period, net of tax (1,153) 2,312 $ (2,345)
Italy Joint Venture      
Income statement and statement of comprehensive income      
Operating revenue 6,913 1,250  
Operating expenses (6,877) (1,058)  
Other expenses (755) (20)  
Income tax expense (61) (54)  
(Loss) / profit for the period (780) 118  
Other comprehensive loss (24)    
Total comprehensive (loss) / income for the period, net of tax (804) 118  
Amount of depreciation and amortization expense included in operating expenses 2,063 290  
Amount of interest expense included in other income or expenses $ 484 $ 68