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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis at Aggregate Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Assets | $ 25,308 | $ 25,264
Liabilities | (14,241) | (14,951)
Recurring fair value measurement |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 2,348 | 2,441
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) | 2,267 | 2,407
Recurring fair value measurement | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets (liabilities) | 81 | 34
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 | (29) | (76)
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 | (29) | (76)
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 | 2,234 | 2,389
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 | 2,234 | 2,389
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 |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 33 | 18
Recurring fair value measurement | Other investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 33 | 18
Recurring fair value measurement | Other investments | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 0 | 0
Recurring fair value measurement | Other investments | 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 |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 110 | 110
Recurring fair value measurement | Receivables from provisional copper and gold sales | 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 | Significant Other Observable Inputs (Level 2) |  |
Disclosure of fair value measurement of assets [line items] |  |
Assets | 110 | 110
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 | $ 0

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