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FINANCE COSTS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Interest $ 452 $ 511
Amortization of debt issue costs 5 5
Amortization of discount (premium) (1) 1
Gain on interest rate hedges (3) (6)
Capitalized Interest (9) 0
Accretion 87 67
Loss on debt extinguishment 29 127
Finance income (15) (14)
Total 545 691
Interest paid, classified as financing activities $ 350 $ 425
Capitalisation rate of borrowing costs eligible for capitalisation 6.10% 6.00%
4.1% Notes Due 2023    
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Borrowings, interest rate (as percent) 4.10%  
6.95% Notes Due 2019    
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Borrowings, interest rate (as percent) 6.95%  
4.4 Percent Notes Due 2021    
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]    
Borrowings, interest rate (as percent) 4.40%