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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 11,767  
Cost at end of year 12,406 $ 11,767
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (1,466) (1,309)
Disposals, intangible assets other than goodwill (14) (216)
Amortization (249) (458)
Foreign currency translation (10) 85
Cost at end of year $ (1,711) $ (1,466)