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Significant events in the current year (Details) R$ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 22, 2021 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2021 BRL (R$) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2021 BRL (R$) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Apr. 30, 2021 shares
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Value of shares acquired |  |  |  |  |  | $ 2,004 | R$ 10,407 |  |  |
Pre-operating and operational stoppage |  |  | $ 152 |  | $ 179 | 263 |  | $ 378 |  |
Renova Foundation |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Provision |  |  | 560 | R$ 2,820 |  |  |  |  |  |
United Steelworkers |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Term for collective bargaining agreement |  | 5 years |  |  |  |  |  |  |  |
Pre-operating and operational stoppage |  | $ 59 |  |  |  |  |  |  |  |
Nacala Logistics Corridor |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Payments in relation to Project Finance | $ 2,517 | 2,517 | $ 2,517 |  |  | 2,517 |  |  |  |
Loss on pre-existing relationship | $ (771) | $ (771) |  |  |  | $ (771) |  |  | $ (798) |
Common share |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Share buyback program, number of shares authorized to be repurchased | shares |  |  |  |  |  |  |  |  |  | 270,000,000
Number of shares repurchased | shares |  | 93,088,200 | 93,088,200 |  |  | 93,088,200 |  |  |  |
Value of shares acquired |  |  | $ 2,004 |  |  |  |  |  |  |
Dividends paid |  | $ 2,200 |  |  |  |  |  |  |  |

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