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Significant Events - Additional Information (Detail)
$ in Millions, R$ in Billions
 6 Months Ended 12 Months Ended
Aug. 08, 2018
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
BRL (R$)
Jun. 30, 2021
USD ($)
Aug. 08, 2018
BRL (R$)
Disclosure of significant events [line items]            
Termination of criminal charges against affected individuals by the federal court   8        
Appeal against termination of criminal charges still pending in federal court   7        
Framework agreement [member] | Definitive And Substantive Settlement Obligation Member [Member]            
Disclosure of significant events [line items]            
Estimated financial effect of contingent liabilities   $ 30,000   R$ 155.0    
Samarco dam failure [member]            
Disclosure of significant events [line items]            
Provision in addition to obligations under the Framework Agreement   $ 3,286 $ 3,421   $ 2,792  
Samarco dam failure [member] | Framework agreement [member]            
Disclosure of significant events [line items]            
Term of agreement   15 years        
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member]            
Disclosure of significant events [line items]            
Term of agreement 2 years          
Estimated financial effect of contingent liabilities   $ 30,000   155.0    
Preliminary agreement suspended amount $ 1,500         R$ 7.7
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member] | Definitive And Substantive Settlement Obligation Member [Member]            
Disclosure of significant events [line items]            
Estimated financial effect of contingent liabilities   $ 30,000   R$ 155.0    
Samarco Mineracao S.A. [member]            
Disclosure of significant events [line items]            
Percentage of interest in joint venture investment   50.00%        
BHP Brasil Ltda [member] | Samarco Germano dam decommissioning [member]            
Disclosure of significant events [line items]            
Provision   $ 164 184      
Percentage of decommissioning cost   50.00%        
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member]            
Disclosure of significant events [line items]            
Provision in addition to obligations under the Framework Agreement   $ 3,100 $ 3,200      
Percentage of remaining costs expected to be incurred by December 2024   80.00%        
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member]            
Disclosure of significant events [line items]            
Investment in Samarco   $ 0        
Dividends received   0        
Profits available for distribution   $ 0        
Percentage of interest in joint venture investment   50.00%        
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]            
Disclosure of significant events [line items]            
Commitments amount   $ 915