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REVENUE - Provisional Copper and Gold Sales (Details) ozt in Thousands, lb in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) lb ozt | Dec. 31, 2016 USD ($) lb ozt
Copper |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Volumes subject to final pricing Copper (millions) Gold (000s) | lb | 40 | 44
Impact on net income before taxation of 10% movement in market price US$ | $ 13 | $ 11
Gold |  |
Disclosure of Disaggregation of Revenue [Line Items] |  |
Volumes subject to final pricing Copper (millions) Gold (000s) | ozt | 0 | 13
Impact on net income before taxation of 10% movement in market price US$ | $ 0 | $ 2

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- Definition [Line Items] for Disclosure of disaggregation of revenue [Table] + References No definition available. + Details
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- Definition Revenue before impact of market movements + References No definition available. + Details
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- Definition Revenue Mineral Sales, Volume + References No definition available. + Details
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- Details
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- Details
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