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DEFERRED INCOME TAXES - Sources of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | $ 1,069 | $ 977
Deferred tax liabilities | (1,245) | (1,520)
Deferred tax liability (asset) | 176 | 543
Before offset amount |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 1,902 | 1,953
Deferred tax liabilities | (176) | (543)
Tax loss carry forwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 926 | 735
Environmental rehabilitation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 594 | 639
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 175 | 273
Deferred tax liabilities | (1,571) | (1,963)
Post-retirement benefit obligations and other employee benefits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 49 | 47
Accrued interest payable |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 40 | 75
Other working capital |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 23 | 54
Derivative instruments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 74 | 89
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 21 | 41
Inventory |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities | $ (507) | $ (533)

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