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Acquisitions and divestitures - PT Vale Indonesia Tbk (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |
Divestment of shares to Indonesian participants ( as a percentage ) | 8.00% |  |  |
PTVI |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Ownership interest sold in subsidiary (as a percent) |  | 44.30% | 20.00% |
Divestment of shares to Indonesian participants ( as a percentage ) |  |  | 14.90% |
Cash consideration from divestment of shares in subsidiary |  | $ 278 |  |
Loss from divestiture of shares in subsidiary |  |  |  | $ 179
Collective ownership Interest held by the company and SMM, after the divestment (as a percentage) |  | 59.30% |  |
Sumitomo Metal Mining Co., Ltd |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Ownership interest sold in subsidiary (as a percent) |  | 15.00% |  |
Divestment of shares to Indonesian participants ( as a percentage ) |  |  | 5.10% |

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