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Significant Events - Additional Information (Detail)
R$ in Millions
 12 Months Ended
Aug. 08, 2018
BRL (R$)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2019
BRL (R$)
Jun. 30, 2019
USD ($)
Aug. 08, 2018
USD ($)
Disclosure of significant events [line items]                
Funding provided during the period   $ 303,000,000            
Settlement claim     $ 3,503,000,000       $ 3,443,000,000  
Income recognised from insurance settlements   $ 50,000,000            
Samarco dam failure [member]                
Disclosure of significant events [line items]                
Percentage of charges recognised in Group's results   100.00%            
Funding provided during the period   $ 96,000,000            
Additional share of losses   96,000,000 80,000,000 $ 134,000,000        
Provision before tax and after discounting in respect of its obligations under the Framework Agreement     1,285,000,000 1,057,000,000     1,914,000,000  
Provision   586,000,000 429,000,000 $ 38,000,000        
Utilisation of the Samarco dam failure provision   328,000,000 $ 285,000,000          
Samarco dam failure [member] | Dam stabilisation and expert costs [member]                
Disclosure of significant events [line items]                
Utilisation of the Samarco dam failure provision   $ 15,000,000            
Samarco dam failure [member] | State Prosecutors in Minas Gerais [member]                
Disclosure of significant events [line items]                
Settlement claim           R$ 7,500 2,000,000,000  
Samarco dam failure [member] | State Prosecutors in Esprito Santo [member]                
Disclosure of significant events [line items]                
Settlement claim           2,000 520,000,000  
Samarco dam failure [member] | Public defenders in Minas Gerais [member]                
Disclosure of significant events [line items]                
Settlement claim           10,000 2,600,000,000  
Samarco dam failure [member] | Governance Agreement [member] | Federal public prosecution office claim [member]                
Disclosure of significant events [line items]                
Settlement claim R$ 155,000         155,000 40,000,000,000 $ 40,000,000,000
Samarco dam failure [member] | Preliminary Agreement [member] | Federal public prosecution office claim [member]                
Disclosure of significant events [line items]                
Term of agreement 2 years              
Preliminary agreement suspended amount           7,700 2,000,000,000  
Samarco dam failure [member] | Framework agreement [member]                
Disclosure of significant events [line items]                
Term of agreement   15 years            
Samarco Mineracao S.A. [member]                
Disclosure of significant events [line items]                
Percentage of interest in joint venture investment   50.00% 50.00%          
Additional share of losses         $ 655,000,000      
Samarco Mineracao S.A. [member] | Samarco dam failure [member]                
Disclosure of significant events [line items]                
Commitments     $ 1,100,000,000       500,000,000  
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [member]                
Disclosure of significant events [line items]                
Settlement claim           5,500 1,400,000,000  
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian corporate income tax rate [member]                
Disclosure of significant events [line items]                
Settlement claim           4,300 1,100,000,000  
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Framework agreement [member]                
Disclosure of significant events [line items]                
Provision before tax and after discounting in respect of its obligations under the Framework Agreement     200,000,000       200,000,000  
BHP Billiton Brasil Ltda [member] | Samarco Germano dam decommissioning [member]                
Disclosure of significant events [line items]                
Provision   $ 263,000,000            
Percentage of decommissioning cost   50.00%            
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement           2,200 575,000,000  
Allocation period   30 months            
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Insurance bonds [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement           1,300 340,000,000  
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Liquid assets [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement           100 25,000,000  
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Charge over assets [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement           R$ 800 210,000,000  
BHP Billiton Brasil Ltda [member] | Samarco dam failure [member] | Framework agreement [member]                
Disclosure of significant events [line items]                
Provision before tax and after discounting in respect of its obligations under the Framework Agreement     $ 1,300,000,000       1,700,000,000  
Percentage of remaining costs expected to be incurred by December 2020   45.00%            
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member]                
Disclosure of significant events [line items]                
Percentage of interest in joint venture investment   50.00%            
Adjustment in joint venture investment              
Funding provided during the period   $ 96,000,000            
Additional share of losses   96,000,000            
Dividends received   0            
Profits available for distribution             0  
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]                
Disclosure of significant events [line items]                
Undrawn amount   17,000,000            
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Dam stabilisation and expert costs [member]                
Disclosure of significant events [line items]                
Utilisation of the Samarco dam failure provision   $ 15,000,000            
BHP Billiton Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Short-term facility [member]                
Disclosure of significant events [line items]                
Commitments             $ 79,000,000