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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 9,894  
Cost at end of year 8,868  
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (576) $ (267)
Disposals, intangible assets other than goodwill 0 (1)
Amortization (173) (143)
Foreign currency translation 62 (9)
Cost at end of year $ (687) $ (418)