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Brumadinho dam failure - De-characterization of other dams in Brazil (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
De-characterization of dams |  |  |  |  |
Provisions. |  |  |  |  |
Provisions | $ 2,155 |  | $ 2,155 |  | $ 2,289
Discount rate applied to cash flow projections | 4.40% |  | 4.40% |  | 3.50%
De-characterization of upstream structures |  |  |  |  |
Provisions. |  |  |  |  |
Provision for total expected costs to carry out all de-characterization projects | $ 80 | $ 104 | $ 193 | $ 267 |

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