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DISPOSITIONS AND ACQUISITIONS (Purchase Price Allocation) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 21, 2018 USD ($) $ / lb $ / oz | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Income tax rate |  | 21.00% | 21.00% | 35.00%
Tax Authority, In Papua, Indonesia |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Income tax rate | 25.00% |  |  |
PT-FI | Rio Tinto Share In Joint Venture |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets | $ 25 |  |  |
Mineral reserves | 3,056 |  |  |
Mine development, infrastructure and other | 1,559 |  |  |
Liabilities other than taxes | (77) |  |  |
Deferred income taxes, net | (1,063) |  |  |
Total purchase price | $ 3,500 |  |  |
PT-FI | Rio Tinto Share In Joint Venture | Copper |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Price assumption per unit (in dollars per unit) | $ / lb | 3.00 |  |  |
PT-FI | Rio Tinto Share In Joint Venture | Gold |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Price assumption per unit (in dollars per unit) | $ / oz | 1,300 |  |  |

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