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Share Capital - Summary of Share Capital (Parenthetical) (Detail) - 12 months ended Jun. 30, 2021
£ / shares
$ / shares
Special Voting share of US$0.50 par value [member] | BHP Group Plc [member]    
Disclosure of classes of share capital [line items]    
Par value | $ / shares   $ 0.5
5.5% Preference shares [member]    
Disclosure of classes of share capital [line items]    
Par value £ 1  
Dividend rate percentage 5.50%  
5.5% Preference shares [member] | BHP Group Plc [member]    
Disclosure of classes of share capital [line items]    
Par value £ 1  
Dividend rate percentage 5.50%