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Brumadinho dam failure (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Balance at the beginning $ 3,537  
Monetary and present value adjustments 165  
Disbursements (1,093)  
Translation adjustment 303  
Balance at the ending 3,312 $ 3,537
Operating expense 400  
Current liabilities 944 1,156
Non-current liabilities 2,368 2,381
Liabilities 3,312 3,537
Expense incurred in relation to Brumadinho event 620 650
Global Settlement for Brumadinho    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 2,984  
Monetary and present value adjustments 175  
Disbursements (904)  
Translation adjustment 271  
Balance at the ending 2,526 2,984
Liabilities $ 2,526 $ 2,984
Discount rate 9.08% 8.08%
Global Settlement for Brumadinho | Payment Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning $ 1,427  
Monetary and present value adjustments 113  
Disbursements (795)  
Translation adjustment 137  
Balance at the ending 882 $ 1,427
Liabilities 882 1,427
Global Settlement for Brumadinho | Provision For Socio Economic Reparation And Others [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 852  
Monetary and present value adjustments 3  
Disbursements (72)  
Translation adjustment 84  
Balance at the ending 867 852
Liabilities 867 852
Global Settlement for Brumadinho | Provision For Social And Environmental Reparation [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 705  
Monetary and present value adjustments 59  
Disbursements (37)  
Translation adjustment 50  
Balance at the ending 777 705
Liabilities 777 705
Commitment [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 553  
Monetary and present value adjustments (10)  
Disbursements (189)  
Translation adjustment 32  
Balance at the ending 786 553
Operating expense 400  
Liabilities 786 553
Commitment [Member] | Tailings Containment And Geotechnical Safety [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 318  
Monetary and present value adjustments (1)  
Disbursements (80)  
Translation adjustment 19  
Balance at the ending 559 318
Operating expense 303  
Liabilities 559 318
Commitment [Member] | Individual Indemnification [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 115  
Monetary and present value adjustments (4)  
Disbursements (74)  
Translation adjustment 8  
Balance at the ending 45 115
Liabilities 45 115
Commitment [Member] | Other Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning 120  
Monetary and present value adjustments (5)  
Disbursements (35)  
Translation adjustment 5  
Balance at the ending 182 120
Operating expense 97  
Liabilities $ 182 $ 120