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SEGMENT INFORMATION - Segments Adjusted EBITDA (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue      
Total Segments Adjusted EBITDA $ 3,587 $ 3,232 $ 2,875
Depreciation (1,454) (1,439) (1,550)
Amortization (537) (497) (517)
Impairment Loss (66) (192) (245)
Loss on disposals of non-current assets (24) (20) (39)
Finance costs (935) (830) (829)
Finance income 95 69 52
Other non-operating losses, net (97) (82) (42)
Share of (loss) / profit of joint ventures and associates (412) 48 14
Impairment of joint ventures and associates (110) (99)  
Net foreign exchange (loss) / gain (71) 157 (314)
(Loss) / profit before tax $ (24) $ 347 $ (595)