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Significant Events - Additional Information (Detail)
R$ in Millions, $ in Millions
 12 Months Ended
Aug. 08, 2018
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
BRL (R$)
Jun. 30, 2020
USD ($)
Aug. 08, 2018
BRL (R$)
Disclosure of significant events [line items]            
Estimated financial effect of contingent liabilities   $ 2,466 $ 3,147      
Income recognised from insurance settlements   $ 573        
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$ 155,000    
Samarco dam failure [member]            
Disclosure of significant events [line items]            
Percentage of charges recognised in Group's results   100.00%        
Provision in addition to obligations under the Framework Agreement   $ 3,421 2,792   $ 2,051  
Samarco dam failure [member] | Framework agreement [member]            
Disclosure of significant events [line items]            
Term of agreement   15 years        
Term of agreement renewable   1 year        
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   155,000    
Preliminary agreement suspended amount $ 1,500         R$ 7,700
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   155,000    
Samarco Mineracao S.A. [member]            
Disclosure of significant events [line items]            
Percentage of interest in joint venture investment   50.00%        
Samarco Mineracao S.A. [member] | Samarco dam failure [member]            
Disclosure of significant events [line items]            
Commitments   $ 700 700      
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [Member]            
Disclosure of significant events [line items]            
Estimated financial effect of contingent liabilities   1,200   6,200    
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Corporate Income Tax Rate [Member]            
Disclosure of significant events [line items]            
Estimated financial effect of contingent liabilities   900   4,800    
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Framework agreement [member]            
Disclosure of significant events [line items]            
Provision in addition to obligations under the Framework Agreement   300 200      
BHP Brasil Ltda [member] | Samarco Germano dam decommissioning [member]            
Disclosure of significant events [line items]            
Provision   $ 184 232      
Percentage of decommissioning cost   50.00%        
BHP Brasil Ltda [member] | Framework agreement [member] | Insurance bonds [member]            
Disclosure of significant events [line items]            
Interim security amount preliminary agreement   $ 250   1,300    
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   $ 3,200 2,600      
Percentage of remaining costs expected to be incurred by December 2024   95.00%        
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Insurance bonds [member]            
Disclosure of significant events [line items]            
Interim security amount preliminary agreement   $ 420   2,200    
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Charge over assets [member]            
Disclosure of significant events [line items]            
Interim security amount preliminary agreement   150   800    
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member] | Liquid assets [member]            
Disclosure of significant events [line items]            
Interim security amount preliminary agreement   20   R$ 100    
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%        
Commitments   $ 350 $ 350      
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]            
Disclosure of significant events [line items]            
Commitments amount   $ 1,350