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DISPOSITIONS AND ACQUISITIONS (PT-FI Divestment) (Details) - USD ($) $ in Millions | Dec. 21, 2018 | Jan. 01, 2023 | Jan. 01, 2019 | Dec. 31, 2018
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture, net | $ 350 |  |  |
Rio Tinto Share In Joint Venture |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture, net | $ 107 |  |  |
PT Indonesia Papua Metal dan Mineral | PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership interest by parent subsequent to business acquisition | 25.00% |  |  |
Rio Tinto | Rio Tinto Share In Joint Venture |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture, net | $ 3,500 |  |  |
PT Indonesia Asahan Aluminium (Persero) (Inalum) | PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from divestiture, net | $ 3,850 |  |  |
PT Indonesia Asahan Aluminium (Persero) (Inalum) | Interest In PT Indocopper Investama |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of voting interest | 100.00% |  |  |
PT Indonesia Asahan Aluminium (Persero) (Inalum) | PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Percentage of voting interest | 40.00% |  |  |
Ownership interest by parent subsequent to business acquisition | 26.24% |  |  |
PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage of subsidiary |  |  |  | 48.76%
PT-FI | PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership interest by parent subsequent to business acquisition | 51.24% |  |  |
PT-FI |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage of subsidiary | 48.76% |  |  |
PT-FI | Scenario, forecast |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage of subsidiary |  | 49.00% | 81.00% |
PT-FI | PT Indonesia Papua Metal dan Mineral |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage | 9.36% |  |  |

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