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FINANCE COSTS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Interest $ 342 $ 435
Amortization of debt issue costs 2 2
Amortization of premium (1) (1)
Interest expense on lease liabilities 5 6
Gain on interest rate hedges (5) (6)
Interest capitalized (24) (14)
Accretion 41 75
Loss on debt extinguishment 15 3
Finance income (28) (31)
Total 347 469
Interest paid, classified as operating activities $ 295 $ 333
Capitalisation rate of borrowing costs eligible for capitalisation 5.90% 6.30%