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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 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 12,658 $ 14,386
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (1,309) (880)
Disposals, intangible assets other than goodwill (1) (12)
Amortization (232) (450)
Foreign currency translation 186 9
Cost at end of year $ (1,354) $ (1,309)