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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 46,506 | $ 44,392
Recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 5,921 | 3,641
Recurring fair value measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 5,616 | 3,572
Recurring fair value measurement | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 305 | 69
Recurring fair value measurement | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 0 | 0
Recurring fair value measurement | Cash and equivalents |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 5,188 | 3,314
Recurring fair value measurement | Cash and equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 5,188 | 3,314
Recurring fair value measurement | Cash and equivalents | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Cash and equivalents | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Other investments [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 428 | 258
Recurring fair value measurement | Other investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 428 | 258
Recurring fair value measurement | Other investments [Member] | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Other investments [Member] | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 40 | 1
Recurring fair value measurement | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Derivatives | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 40 | 1
Recurring fair value measurement | Derivatives | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 265 | 68
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 265 | 68
Recurring fair value measurement | Receivables from provisional copper and gold sales [Member] | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 0 | $ 0

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- Definition Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_c&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets less the amount of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 1 -IssueDate 2019-01-01 -Paragraph IG63 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2019-en-r&anchor=para_IG63&doctype=Implementation%20Guidance -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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