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COST OF SALES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | $ 1,202 | $ 984 | $ 2,353 | $ 1,954
Depreciation expense | 566 | 466 | 1,090 | 901
Royalty expense | 127 | 87 | 222 | 165
Community relations | 5 | 8 | 11 | 15
Cost of sales | 1,900 | 1,545 | 3,676 | 3,035
Inventory reduction amount | 1 | 12 | 18 | 16
Gold |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 1,121 | 921 | 2,201 | 1,815
Depreciation expense | 498 | 431 | 972 | 815
Royalty expense | 116 | 78 | 200 | 144
Community relations | 5 | 7 | 10 | 13
Cost of sales | 1,740 | 1,437 | 3,383 | 2,787
Copper |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 79 | 63 | 148 | 139
Depreciation expense | 63 | 28 | 106 | 70
Royalty expense | 11 | 9 | 22 | 21
Community relations | 0 | 1 | 1 | 2
Cost of sales | 153 | 101 | 277 | 232
Other |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 2 | 0 | 4 | 0
Depreciation expense | 5 | 7 | 12 | 16
Royalty expense | 0 | 0 | 0 | 0
Community relations | 0 | 0 | 0 | 0
Cost of sales | $ 7 | $ 7 | $ 16 | $ 16

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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 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_103&doctype=Standard -URIDate 2019-03-27 + Details
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