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FINANCIAL INSTRUMENTS - Cash Flow Hedge Gains (Losses) in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | $ (169) |
Effective portion of change in fair value of hedging instruments | 8 | $ (16)
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | (2) | 23
Accumulated other comprehensive income, ending balance | (158) | (169)
Cash flow hedge |  |
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | (30) | (43)
Effective portion of change in fair value of hedging instruments | 20 | (19)
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | (5) | 27
Accumulated other comprehensive income, ending balance | (15) | (30)
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 5
Portion of hedge gain (loss) expected to affect 2017 earnings | 0 |
Gold/Silver | Cash flow hedge |  |
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | 2 | 9
Effective portion of change in fair value of hedging instruments | 0 | 0
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | (2) | (7)
Accumulated other comprehensive income, ending balance | 0 | 2
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 0
Portion of hedge gain (loss) expected to affect 2017 earnings | 0 |
Copper | Cash flow hedge |  |
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | (7) | 0
Effective portion of change in fair value of hedging instruments | 17 | (11)
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | (10) | (4)
Accumulated other comprehensive income, ending balance | 0 | (7)
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 0
Portion of hedge gain (loss) expected to affect 2017 earnings | 0 |
Fuel | Cash flow hedge |  |
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | (8) | (32)
Effective portion of change in fair value of hedging instruments | 4 | (8)
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | 4 | 27
Accumulated other comprehensive income, ending balance | 0 | (8)
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 5
Fuel | Cash flow hedge | Cost of sales [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Portion of hedge gain (loss) expected to affect 2017 earnings | 0 |
Interest rate contracts | Cash flow hedge |  |
Disclosure of detailed information about hedges [line items] |  |
Accumulated other comprehensive income, beginning balance | (17) | (20)
Effective portion of change in fair value of hedging instruments | (1) | 0
Realized (gains) losses on derivatives designated as cash flow hedges, net of tax $2 and ($9) | 3 | 3
Accumulated other comprehensive income, ending balance | (15) | (17)
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | $ 0
Interest rate contracts | Cash flow hedge | Interest expense [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Portion of hedge gain (loss) expected to affect 2017 earnings | $ 0 |

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- Definition Estimated Reclassification Adjustments on Cash Flow Hedges, Next Fiscal Year + References No definition available. + Details
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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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