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FINANCE COSTS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Interest $ 435 $ 452
Amortization of debt issue costs 2 5
Amortization of discount (premium) (1) (1)
Interest expense on lease liabilities 6 0
Gain on interest rate hedges (6) (3)
Interest capitalized (14) (9)
Accretion 75 87
Loss on debt extinguishment 3 29
Finance income (31) (15)
Total 469 545
Interest paid, classified as operating activities $ 333 $ 350
Capitalisation rate of borrowing costs eligible for capitalisation 6.30% 6.10%
4.4 Percent Notes Due 2021    
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Borrowings, interest rate (as percent) 4.40%