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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 32,602 | $ 22,631
Liabilities | (14,135) | $ (13,246)
Recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 2,421 |
Recurring fair value measurement | Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 2,374 |
Recurring fair value measurement | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 47 |
Recurring fair value measurement | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 0 |
Recurring fair value measurement | Derivatives |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 2 |
Recurring fair value measurement | Derivatives | Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 |
Recurring fair value measurement | Derivatives | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 2 |
Recurring fair value measurement | Derivatives | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Liabilities | 0 |
Recurring fair value measurement | Cash and equivalents |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 2,153 |
Recurring fair value measurement | Cash and equivalents | Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 2,153 |
Recurring fair value measurement | Cash and equivalents | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 |
Recurring fair value measurement | Cash and equivalents | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 |
Recurring fair value measurement | Other investments |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 221 |
Recurring fair value measurement | Other investments | Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 221 |
Recurring fair value measurement | Other investments | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 |
Recurring fair value measurement | Other investments | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 |
Recurring fair value measurement | Receivables from provisional copper and gold sales |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | (45) |
Recurring fair value measurement | Receivables from provisional copper and gold sales | Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 |
Recurring fair value measurement | Receivables from provisional copper and gold sales | Significant other observable inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 45 |
Recurring fair value measurement | Receivables from provisional copper and gold sales | Significant Unobservable Inputs (Level 3) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 0 |

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