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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation $ 215 $ 347
Property, plant and equipment, revalued assets, at cost 3,688 3,287
Accumulated fair value adjustments    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation $ 215 $ 347