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Significant Events - Additional Information (Detail)
R$ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Aug. 08, 2018
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2020
BRL (R$)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
Aug. 08, 2018
BRL (R$)
Disclosure of significant events [line items]                  
Funding provided during the period     $ 242            
Impairment losses     494 $ 264 $ 333        
Settlement claim   $ 2,848 2,848 3,443          
Income recognised from insurance settlements     $ 489            
Samarco dam failure [member]                  
Disclosure of significant events [line items]                  
Percentage of charges recognised in Group's results     100.00%            
Impairment losses     $ 95 96 80        
Provision in addition to obligations under the Framework Agreement   2,051 2,051 $ 1,914 $ 1,285        
Samarco dam failure [member] | State Prosecutors in Minas Gerais [member]                  
Disclosure of significant events [line items]                  
Settlement claim   1,400 1,400     R$ 7,500      
Samarco dam failure [member] | State Prosecutors in Esprito Santo [member]                  
Disclosure of significant events [line items]                  
Settlement claim   365 365     2,000      
Samarco dam failure [member] | Public defenders in Minas Gerais [member]                  
Disclosure of significant events [line items]                  
Settlement claim   1,800 $ 1,800     10,000      
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                
Settlement claim $ 28,000 28,000 $ 28,000     155,000     R$ 155,000
Preliminary agreement suspended amount $ 1,400               R$ 7,700
Samarco Mineracao S.A. [member]                  
Disclosure of significant events [line items]                  
Percentage of interest in joint venture investment     50.00% 50.00%          
Samarco Mineracao S.A. [member] | Samarco dam failure [member]                  
Disclosure of significant events [line items]                  
Commitments   400 $ 400 $ 500          
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Social Contribution Levy [Member]                  
Disclosure of significant events [line items]                  
Settlement claim   1,000 1,000     5,500      
Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Brazilian Corporate Income Tax Rate [Member]                  
Disclosure of significant events [line items]                  
Settlement claim   800 800     4,500      
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   200 200 200          
BHP Brasil Ltda [member] | Samarco Germano dam decommissioning [member]                  
Disclosure of significant events [line items]                  
Provision     $ 227 263          
Percentage of decommissioning cost     50.00%            
BHP Brasil Ltda [member] | Samarco dam failure [member]                  
Disclosure of significant events [line items]                  
Funding provided during the period     $ 0            
Impairment losses     0            
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   1,800 1,800 1,700          
Interim security amount preliminary agreement   400 $ 400     2,200      
Allocation period     30 months            
Percentage of remaining costs expected to be incurred by December 2021     75.00%            
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   240 $ 240     1,300      
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   145 145     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 20     R$ 100      
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member]                  
Disclosure of significant events [line items]                  
Investment in Samarco   0 0            
Dividends received     0            
Profits available for distribution   0 $ 0            
Percentage of interest in joint venture investment     50.00%            
Commitments   200 $ 200 $ 250          
Payment of approved amount to jointventure   $ 68              
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]                  
Disclosure of significant events [line items]                  
Commitments amount               $ 44  
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member] | Dam Stabilisation And Expert Costs [Member]                  
Disclosure of significant events [line items]                  
Commitments amount             $ 212