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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | $ 45,180 | $ 44,392
Liabilities | (14,434) | $ (14,565)
Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 4,181 |
Recurring fair value measurement | Cash and equivalents |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 3,743 |
Recurring fair value measurement | Other investments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 250 |
Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Liabilities | (35) |
Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets | 153 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Assets (liabilities) | 3,993 |
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 | 3,743 |
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 | 250 |
Level 1 of fair value hierarchy [member] | Recurring fair value measurement | Derivatives |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items] |  |
Liabilities | 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) | 188 |
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] |  |
Liabilities | (35) |
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 | 153 |
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] |  |
Liabilities | 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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