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Significant Events - Additional Information (Detail)
$ in Millions, R$ in Billions
 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
BRL (R$)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Disclosure of significant events [line items]        
Estimated financial effect of contingent liabilities $ 2,278   $ 2,466  
Brazilian Social Contribution Levy [Member]        
Disclosure of significant events [line items]        
Percentage of interest in joint venture investment 50.00%      
Estimated financial effect of contingent liabilities $ 200   1,200  
Gross provisions 1,100      
Net provisions 900      
Aggregate court deposit paid 200   0  
Framework agreement [member] | Definitive And Substantive Settlement Obligation Member [Member]        
Disclosure of significant events [line items]        
Estimated financial effect of contingent liabilities $ 32,000 R$ 155    
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 $ 3,681   3,421 $ 2,792
Samarco dam failure [member] | Framework agreement [member] | Fundação Renova [member]        
Disclosure of significant events [line items]        
Maximum funding cap 1,000      
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member]        
Disclosure of significant events [line items]        
Estimated financial effect of contingent liabilities $ 32,000 R$ 155    
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 $ 1,000   700  
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 1,100   900  
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 $ 400   300  
BHP Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member]        
Disclosure of significant events [line items]        
Percentage of remaining costs expected to be incurred by June 2025 85.00%      
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%      
Commitments $ 500   $ 350  
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]        
Disclosure of significant events [line items]        
Commitments amount $ 915