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OTHER EXPENSE (INCOME) OTHER EXPENSE (INCOME) - Impairment reversal (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 $ 12 $ 59 $ 15 $ 61
Non-current assets or disposal groups classified as held for sale [member]        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 12 35 15 37
Intangible assets other than goodwill [member]        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 $ 0 $ 24 $ 0 $ 24