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Litigations - Judicial deposits (Details)
$ in Millions, R$ in Billions
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Judicial deposits      
Deposits with court   $ 1,268 $ 3,133
Bank guarantees for judicial deposits R$ 11.3 2,200  
Tax litigation      
Judicial deposits      
Deposits with court   988 1,278
Civil litigation      
Judicial deposits      
Deposits with court   85 86
Labor litigation      
Judicial deposits      
Deposits with court   177 246
Environmental litigation      
Judicial deposits      
Deposits with court   $ 18 41
Brumadinho event      
Judicial deposits      
Deposits with court     $ 1,482