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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 11,635  
Cost at end of year 14,386 $ 11,635
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (880) (576)
Disposals 12 0
Amortization (450) (371)
Foreign currency translation 9 67
Cost at end of year $ (1,309) $ (880)