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COST OF SALES (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |
Direct mining cost | $ 3,365 | $ 3,520
Depreciation | 1,647 | 1,574
Royalty expense | 244 | 265
Community relations | 44 | 46
Cost of sales | 5,300 | 5,405
Inventory reduction amount | 21 | 68
Employee benefits expense | 1,051 | 1,048
Gold |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |
Direct mining cost | 3,063 | 3,215
Depreciation | 1,529 | 1,504
Royalty expense | 206 | 224
Community relations | 38 | 37
Cost of sales | 4,836 | 4,980
Copper |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |
Direct mining cost | 274 | 228
Depreciation | 83 | 45
Royalty expense | 38 | 41
Community relations | 4 | 5
Cost of sales | 399 | 319
Other |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |
Direct mining cost | 28 | 77
Depreciation | 35 | 25
Royalty expense | 0 | 0
Community relations | 2 | 4
Cost of sales | $ 65 | $ 106

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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