XML 12 R43.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Significant Events - Additional Information (Detail)
R$ in Millions
 6 Months Ended 12 Months Ended
Aug. 08, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
BRL (R$)
Nov. 30, 2019
USD ($)
Aug. 08, 2018
BRL (R$)
Jun. 30, 2018
USD ($)
Disclosure of significant events [line items]                
Impairment losses   $ 29,000,000 $ 168,000,000 $ 264,000,000        
Income recognised from insurance settlements   40,000,000            
Samarco dam failure [member]                
Disclosure of significant events [line items]                
Funding provided during the period   27,000,000            
Impairment losses   27,000,000 47,000,000 96,000,000        
Provision before tax and after discounting in respect of its obligations under the Framework Agreement   1,728,000,000   1,914,000,000       $ 1,285,000,000
Utilisation of the Samarco dam failure provision   $ 177,000,000            
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]                
Settlement claim $ 38,000,000,000 $ 38,000,000,000     R$ 155,000   R$ 155,000  
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 $ 1,900,000,000           R$ 7,700  
Samarco Mineracao S.A. [member]                
Disclosure of significant events [line items]                
Impairment losses [1],[2]   $ 27,000,000 $ 47,000,000 $ 96,000,000        
Percentage of interest in joint venture investment [1],[2]   50.00% 50.00% 50.00%        
BHP Brasil [member] | Samarco Germano dam decommissioning [member]                
Disclosure of significant events [line items]                
Provision before tax and after discounting in respect of its obligations under the Framework Agreement   $ 261,000,000   $ 263,000,000        
Percentage of decommissioning cost   50.00%            
BHP Brasil [member] | Samarco dam failure [member]                
Disclosure of significant events [line items]                
Investment in Samarco              
BHP Brasil [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   $ 1,500,000,000   $ 1,700,000,000        
Percentage of remaining costs expected to be incurred by December 2021   70.00%            
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement   $ 545,000,000     2,200      
Allocation period   30 months            
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Insurance bonds [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement   $ 320,000,000     1,300      
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Liquid assets [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement   25,000,000     100      
BHP Brasil [member] | Samarco dam failure [member] | Preliminary Agreement [member] | Charge over assets [member]                
Disclosure of significant events [line items]                
Interim security amount preliminary agreement   200,000,000     R$ 800      
BHP Brasil [member] | Samarco Mineracao S.A. [member]                
Disclosure of significant events [line items]                
Funding provided during the period   27,000,000            
Dividends received   0            
Profits available for distribution   $ 0            
Percentage of interest in joint venture investment   50.00%            
BHP Brasil [member] | Samarco Mineracao S.A. [member] | Samarco dam failure [member]                
Disclosure of significant events [line items]                
Undrawn amount   $ 44,000,000            
Commitments amount           $ 44,000,000    
BHP Brasil [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   8,000,000            
Commitments amount   $ 212,000,000            
[1] Following a change to IAS 28 the loss from working capital funding provided during the period will now be disclosed as an impairment included within the Samarco impairment expense line item and not as an operating loss. Comparative periods have been restated to reflect the change.
[2] Refer to note 9 Significant events – Samarco dam failure for further information.