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OTHER ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Other Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 215 | $ 215 |
Intangible assetsc | 398 | 307 |
Investments: [Abstract] |  |  |
Assurance bond | 126 | 123 |
Fixed income and equity securities | 29 | 30 |
Other | 36 | 48 |
Disposal group, contingent consideration | 189 | 234 |
Legally restricted fundsg | 181 | 189 |
Long-term receivable for taxes | 260 | 445 |
Rio Tinto’s share of ARO | 0 | 68 |
Long-term employee receivables | 20 | 20 |
Other | 132 | 146 |
Total other assets | 2,172 | 2,273 |
Finite-Lived Intangible Assets, Accumulated Amortization | 51 | 46 |
Equity in affiliated companies’ net earnings | 8 | 10 | $ 11
PT-FI |  |  |
Investments: [Abstract] |  |  |
Long-term receivable for taxes | 493 | 417 |
Cerro Verde |  |  |
Investments: [Abstract] |  |  |
Long-term receivable for taxes | 183 | 185 |
PT Smelting |  |  |
Investments: [Abstract] |  |  |
PT Smelting | $ 125 | 61 |
Ownership percentage | 25.00% |  |
Equity in affiliated companies’ net earnings | $ 11 | 68 |
Accounts Receivable, Gross, Current | 176 | 308 |
NEW MEXICO |  |  |
Investments: [Abstract] |  |  |
Legally restricted funds for asset retirement obligations at New Mexico mines | $ 180 | $ 180 |

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