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OTHER NON-OPERATING LOSSES, NET (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
OTHER NON-OPERATING LOSSES, NET        
Loss from early debt redemption   $ (124)   $ (124)
Change of fair value of derivatives $ (20) 14 $ (22) (23)
Other gains / (losses) 4 (6) (3) (5)
Other non-operating losses, net $ (16) $ (116) $ (25) $ (152)