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Brumadinho dam failure - Arbitration proceedings in Brazil filed by shareholders and a class association (Details) - Arbitration proceedings in Brazil filed by shareholders and a class association R$ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 BRL (R$) item | Dec. 31, 2020 USD ($) item
Contingencies |  |
Number of arbitration filed by minority shareholders | 1 | 1
Number of minority shareholders who filled one arbitration | 166 | 166
Number of arbitration filed by class association allegedly representing all minority shareholders | 1 | 1
Number of arbitration filed by foreign investment funds | 1 | 1
Total number of proceedings | 3 | 3
Estimated losses on legal proceedings | R$ 1,800 | $ 346

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- Definition Represents the number of arbitration filed by class association allegedly representing all minority shareholders. + References No definition available. + Details
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