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Acquisitions and divestitures - Business combinations - NLC (Details) - Nacala Logistics Corridor - USD ($) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 22, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |
Settlement of loans with third parties | $ 2,517 | $ 2,517 | $ 2,517 |
Percentage of voting capital acquired | 50.00% |  |  |
Loss on pre-existing relationship | $ (771) | $ (771) | $ (771) | $ (798)
Discount rate |  | 11.60% | 11.60% |

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