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FINANCE COSTS, NET (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | May 02, 2013 | Sep. 30, 2008
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Interest | $ 511 | $ 591 |  |
Amortization of debt issue costs | 5 | 17 |  |
Amortization of discount | 1 | 2 |  |
Accretion | 67 | 50 |  |
Loss on debt extinguishment | 127 | 129 |  |
Finance income | (14) | (13) |  |
Total | 691 | 775 |  |
Interest paid, classified as financing activities | $ 425 | $ 513 |  |
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% |  |  |
2.5 Percent Notes Due 2018 |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Borrowings, interest rate (as percent) |  | 2.50% | 2.50% |
4.4 Percent Notes Due 2021 |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Borrowings, interest rate (as percent) |  | 4.40% |  |
4.95 Percent Notes Due 2020 |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Borrowings, interest rate (as percent) |  | 4.95% |  |
6.8 Percent Notes Due 2019 |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Borrowings, interest rate (as percent) |  | 6.80% |  | 6.80%
6.95 Percent Notes Due 2020 |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Borrowings, interest rate (as percent) |  | 6.95% |  |
Interest rate hedges |  |  |  |
Disclosure of Detailed Information about Finance Income (Expense) [Line Items] |  |  |  |
Gain on interest rate hedges | $ (6) | $ (1) |  |

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