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Impairment and onerous contracts (Details) R$ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 BRL (R$) Plant | Dec. 31, 2020 USD ($) Plant | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Impairment and onerous contracts |  |  |  |
Discount rate on cash flows |  | 5.93% |  |
Finance cost |  | $ (4,811) | $ (3,413) | $ (4,957)
Moatize Mine, Mozambique |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | $ 137 | 1,691 |
Percentage of Non-controlling interest | 15.00% | 15.00% |  |
Number of plants revamp | Plant | 2 | 2 |  |
Vale Nouvelle Caledonie S.A.S. |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | $ 882 |  |
Finance cost |  | 500 |  |
Base metals - nickel |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | 882 | $ 2,511 |
Goodwill |  | 1,926 |  |
Goodwill impairment |  | $ 0 |  |
Base metals - nickel | Minimum |  |  |  |
Impairment and onerous contracts |  |  |  |
Discount rate on cash flows |  | 4.50% | 5.00% |
Base metals - nickel | Maximum |  |  |  |
Impairment and onerous contracts |  |  |  |
Discount rate on cash flows |  | 5.10% | 6.00% |
Nickel CGU |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss | R$ | R$ 0 |  |  |
Non-current assets |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | $ 2,018 | $ 4,321 | 184
Onerous contracts |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  |  | 240 | 393
Disposals of non-current assets |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | 225 | 513 | 322
Impairment and disposals of non-current assets |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | 2,243 | 5,074 | 899
Impairment and disposals of non-current assets | Base metals - nickel |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | 382 |  |
Coal |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | 935 | 1,691 |
Several segments | Other assets |  |  |  |
Impairment and onerous contracts |  |  |  |
Impairment loss |  | $ 201 | $ 119 | $ 184
Ferrous minerals |  |  |  |
Impairment and onerous contracts |  |  |  |
Discount rate on cash flows |  | 5.60% | 6.30% |

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