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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 14,386  
Cost at end of year 11,767 $ 14,386
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (1,309) (880)
Non-cash disposals 216 0
Disposals 0 12
Amortization (458) (450)
Foreign currency translation 85 9
Cost at end of year $ (1,466) $ (1,309)