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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Italy joint venture - Reconciliation of Adjusted EBITDA (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Adjusted EBITDA      
Adjusted EBITDA $ 3,587 $ 3,232 $ 2,875
Impairment Loss (66) (192) (245)
Gain / (loss) on disposals of non-current assets (24) (20) (39)
Net finance costs (935) (830) (829)
Other nonoperating (losses) / gains (97) (82) (42)
Income tax expense 472 635 220
(Loss) / profit for the period (496) 2,420 $ (553)
Italy Joint Venture Segment      
Reconciliation of Adjusted EBITDA      
Adjusted EBITDA 2,131 482  
Depreciation and amortization (2,063) (290)  
Impairment Loss (27)    
Gain / (loss) on disposals of non-current assets (4)    
Net finance costs (468) (68)  
Other nonoperating (losses) / gains (288) 48  
Income tax expense (61) (54)  
(Loss) / profit for the period $ (780) $ 118