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SEGMENT INFORMATION - Segments Adjusted EBITDA (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue        
Total Segments Adjusted EBITDA $ 857 $ 931 $ 1,711 $ 1,792
Depreciation (328) (386) (674) (776)
Amortization (130) (146) (256) (268)
Impairment (loss) / reversal (7) (8) (10) (5)
Gain / (loss) on disposal of non-current assets (20) (2) (37) (9)
Gain / (loss) on sale of subsidiaries 20   20  
Finance costs (206) (232) (423) (447)
Finance income 12 24 31 46
Other non-operating losses, net (16) (116) (25) (152)
Share of loss of joint ventures and associates   (10)   (22)
Impairment of joint ventures and associates   (110)   (110)
Net foreign exchange gain (11) (53) 1 62
Profit /(loss) before tax $ 171 $ (108) $ 338 $ 111