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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 4,465  
Cost at end of year 9,894 $ 4,465
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (267) (189)
Amortization (289) (93)
Foreign currency translation (20) 15
Cost at end of year $ (576) $ (267)