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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% |

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