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Brumadinho dam failure (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Monetary and present value adjustments $ 188    
Disbursements (621)    
Translation adjustment 257    
Operating expense 140    
Liability 3,276   $ 3,312
Current liabilities 1,201   944
Non-current liabilities 2,075   $ 2,368
Expense incurred in relation to Brumadinho event 242 $ 277  
Global Settlement For Brumadinho [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 2,526    
Monetary and present value adjustments 155    
Disbursements (506)    
Translation adjustment 195    
Balance at the ending $ 2,370    
Discount rate 9.37%   9.08%
Global Settlement For Brumadinho [Member] | Payment Obligations [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning $ 882    
Monetary and present value adjustments 42    
Disbursements (243)    
Translation adjustment 67    
Balance at the ending 748    
Global Settlement For Brumadinho [Member] | Provision For Socio Economic Reparation And Others [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 867    
Monetary and present value adjustments 62    
Disbursements (238)    
Translation adjustment 63    
Balance at the ending 754    
Global Settlement For Brumadinho [Member] | Provision For Social And Environmental Reparation [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 777    
Monetary and present value adjustments 51    
Disbursements (25)    
Translation adjustment 65    
Balance at the ending 868    
Commitment [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 786    
Monetary and present value adjustments 33    
Disbursements (115)    
Translation adjustment 62    
Balance at the ending 906    
Operating expense 140    
Commitment [Member] | Tailings Containment And Geotechnical Safety [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 559    
Monetary and present value adjustments 30    
Disbursements (67)    
Translation adjustment 45    
Balance at the ending 567    
Commitment [Member] | Individual Indemnification [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 45    
Monetary and present value adjustments 2    
Disbursements (32)    
Translation adjustment 3    
Balance at the ending 100    
Operating expense 82    
Commitment [Member] | Other Commitments [Member]      
IfrsStatementLineItems [Line Items]      
Balance at the beginning 182    
Monetary and present value adjustments 1    
Disbursements (16)    
Translation adjustment 14    
Balance at the ending 239    
Operating expense $ 58