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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 44,392 | $ 22,631
Liabilities | (14,565) | (13,246)
Recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 3,641 | 1,856
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) | 3,572 | 1,780
Recurring fair value measurement | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 69 | 76
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 | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 1 | 0
Recurring fair value measurement | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Recurring fair value measurement | Derivatives | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 1 | 0
Recurring fair value measurement | Derivatives | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 | 0
Recurring fair value measurement | Cash and equivalents |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 3,314 | 1,571
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 | 3,314 | 1,571
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 | 258 | 209
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 | 258 | 209
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 | Receivables from provisional copper and gold sales [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 68 | 76
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 | 68 | 76
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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