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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
Dec. 31, 2020
BRL (R$)
item
Dec. 31, 2020
USD ($)
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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