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DEBT AND FINANCING COSTS - Components of Financing Costs, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Interest expense $ 438 $ 430 $ 441
Amortization of debt issuance costs 8 7 9
Capitalized interest (12) (37) (44)
Loss (gain) on extinguishment of debt (160) 75 94
Interest income (7) (13) (22)
Financing costs, net $ 267 $ 462 $ 478