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FINANCIAL INSTRUMENTS - Gains (Losses) on Non-hedge Derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | $ 0 | $ 6
Non-hedging contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedge ineffectiveness | 0 | (5)
Gains (losses) on change in fair value of derivatives | 0 | 11
Gold |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | 0 | 4
Silver |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | 2 | 7
Copper |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | 0 | (1)
Fuel |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | 1 | 0
Currency contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on change in fair value of derivatives | $ (3) | $ 1

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- Definition The gain (loss) recognised in profit or loss 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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