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REVENUE - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) $ / pound | Dec. 31, 2016 USD ($) $ / pound $ / ounce
Gold |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Percentage of composition of principal product (as percent) | 90.00% |
Provisional pricing gain (loss) | $ 1 | $ 0
Average price of sales subject to final settlement (copper in dollars per pound; gold in dollars per oz) | $ / ounce |  | 1,152
Copper |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Provisional pricing gain (loss) | $ 46 | $ (22)
Average price of sales subject to final settlement (copper in dollars per pound; gold in dollars per oz) | $ / pound | 3.29 | 2.51

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- Definition Adjustments for gains (losses) on changes in the fair value of derivatives to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: At fair value [member]; Derivatives [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 + Details
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