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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]            
Asset impairments $ 1,736 $ 0 $ 1,700 $ 1,736 $ 0 $ 0