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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | $ 46,528 | $ 46,506
Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 5,847 |
Recurring fair value measurement | Cash and equivalents |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 5,138 |
Recurring fair value measurement | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 377 |
Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 50 |
Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 282 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 5,515 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Cash and equivalents |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 5,138 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 377 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant other observable inputs (Level 2) | Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 332 |
Significant other observable inputs (Level 2) | Recurring fair value measurement | Cash and equivalents |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant other observable inputs (Level 2) | Recurring fair value measurement | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant other observable inputs (Level 2) | Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 50 |
Significant other observable inputs (Level 2) | Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 282 |
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 0 |
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Cash and equivalents |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 0 |
Significant Unobservable Inputs (Level 3) | Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | $ 0 |

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