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Brumadinho dam failure - Arbitration proceedings in Brazil filed by minority stockholders and a class association (Details) - 12 months ended Dec. 31, 2021
R$ in Millions, $ in Millions
USD ($)
stockholder
item
BRL (R$)
stockholder
item
Arbitration proceedings in Brazil filed by minority stockholders and a class association    
Contingencies    
Number of arbitration filed by minority stockholders 1 1
Number of minority stockholders who filled one arbitration | stockholder 385 385
Number of arbitration filed by class association allegedly representing all minority stockholders 2 2
Number of arbitration filed by foreign investment funds 3 3
Total number of proceedings 6 6
Arbitration proceedings in Brazil filed by minority stockholders and a class association, proceeding one    
Contingencies    
Estimated losses on legal proceedings $ 323 R$ 1,800
Arbitration proceedings in Brazil filed by minority stockholders and a class association, proceeding two    
Contingencies    
Estimated losses on legal proceedings $ 700 R$ 3,900