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Income taxes - Additional information (Details)
R$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended 48 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
BRL (R$)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Reduction of tax losses if the tax authority does not accept the tax treatment     $ 115   $ 215   $ 551                    
Total subsidiary assessments of deferred tax     669 R$ 3,732 695 R$ 3,614                      
Deferred tax liabilities $ 1,881   1,881   1,770   $ 1,882 $ 1,881       $ 337 R$ 1,883 $ 337 R$ 1,883 $ 337 R$ 1,883
Gain from leading case judgment     145 808 60 313                      
Transfer pricing over the exportation of ores to a foreign subsidiary                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Assessed amount under discussion with tax authorities 3,544   3,544   2,296     3,544   R$ 19,780 R$ 11,930            
Reduction of tax losses if the tax authority does not accept the tax treatment     552 3,080 450 2,340                      
Amount under discussion for foreign subsidiary               1,885 R$ 10,519                
Expenses of interest on capital                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Reduction of tax losses if the tax authority does not accept the tax treatment     125 699                          
Amount under discussion     981 5,477 659 3,423                      
Deduction of CSLL in Brazil                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Assessed amount under discussion with tax authorities 422   422   435     $ 422   R$ 2,357 R$ 2,259            
Goodwill amortization                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Amount under discussion     287 1,603 $ 300 R$ 1,558                      
Incidence of IRPJ and CSLL on SELIC rate in the repetition of undue payment                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Gain from leading case judgment     34                            
Expenses with payments to Fundacao Renova                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Amount under discussion $ 21 R$ 115 426 2,376                          
Proceeding related to income tax paid abroad                                  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]                                  
Amount under discussion     $ 399 R$ 2,225