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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 9,894  
Cost at end of year 11,635 $ 9,894
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (576) (267)
Amortization (371) (289)
Foreign currency translation 67 (20)
Cost at end of year $ (880) $ (576)