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OTHER ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Other Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 215 | $ 217 |
Intangible assetsc | 306 | 305 |
Investments: [Abstract] |  |  |
Assurance bond | 123 | 120 |
Available-for-sale securities | 30 | 50 |
Other | 48 | 50 |
Disposal group, contingent consideration | 234 | 196 |
Legally restricted fundsg | 189 | 182 |
Long-term receivable for taxes | 445 | 129 |
Rio Tinto's share of ARO | 68 | 71 |
Long-term employee receivables | 20 | 32 |
Other | 144 | 130 |
Total other assets | 2,270 | 1,956 |
Finite-Lived Intangible Assets, Accumulated Amortization | 46 | 37 |
Equity in affiliated companies’ net earnings (losses) | 10 | 11 | $ (3)
PT-FI |  |  |
Investments: [Abstract] |  |  |
Long-term receivable for taxes | 417 | 331 |
Cerro Verde |  |  |
Investments: [Abstract] |  |  |
Long-term receivable for taxes | 185 | 277 |
PT Smelting |  |  |
Investments: [Abstract] |  |  |
PT Smelting | $ 61 | 83 |
Ownership percentage | 25.00% |  |
Equity in affiliated companies’ net earnings (losses) | $ 68 | 39 |
Accounts Receivable, Gross, Current | 308 | 283 |
NEW MEXICO |  |  |
Investments: [Abstract] |  |  |
Legally restricted funds for asset retirement obligations at New Mexico mines | $ 180 | $ 173 |

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