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Share Capital - Summary of Share Capital (Detail) - shares
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
5.5% Preference shares [member]      
Share capital issued      
Opening number of shares 50,000 50,000  
Closing number of shares 50,000 50,000 50,000
BHP Group Limited [member]      
Share capital issued      
Opening number of shares 2,945,851,394 2,945,851,394 3,211,691,105
Purchase of shares by ESOP Trusts (7,587,353) (5,975,189) (6,854,057)
Employee share awards exercised following vesting 6,948,683 6,893,113 5,902,588
Movement in treasury shares under Employee Share Plans 638,670 (917,924) 951,469
Share bought back and cancelled     (265,839,711)
Closing number of shares 2,945,851,394 2,945,851,394 2,945,851,394
BHP Group Limited [member] | Shares held by the public [member]      
Share capital issued      
Opening number of shares 2,945,621,003 2,944,703,079  
Closing number of shares 2,944,982,333 2,945,621,003 2,944,703,079
BHP Group Limited [member] | Treasury shares [member]      
Share capital issued      
Opening number of shares 230,391 1,148,315  
Closing number of shares 869,061 230,391 1,148,315
BHP Group Limited [member] | Special Voting share of no par value [member]      
Share capital issued      
Opening number of shares 1 1  
Closing number of shares 1 1 1
BHP Group Limited [member] | DLC Dividend share [member]      
Share capital issued      
Opening number of shares 1 1  
Closing number of shares 1 1 1
BHP Group Plc [member]      
Share capital issued      
Opening number of shares 2,112,071,796 2,112,071,796 2,112,071,796
Purchase of shares by ESOP Trusts (185,054) (185,297) (274,069)
Employee share awards exercised following vesting 173,644 222,245 275,984
Movement in treasury shares under Employee Share Plans 11,410 (36,948) (1,915)
Closing number of shares 2,112,071,796 2,112,071,796 2,112,071,796
BHP Group Plc [member] | Shares held by the public [member]      
Share capital issued      
Opening number of shares 2,112,069,025 2,112,032,077  
Closing number of shares 2,112,057,615 2,112,069,025 2,112,032,077
BHP Group Plc [member] | Treasury shares [member]      
Share capital issued      
Opening number of shares 2,771 39,719  
Closing number of shares 14,181 2,771 39,719
BHP Group Plc [member] | Special Voting share of US$0.50 par value [member]      
Share capital issued      
Opening number of shares 1 1  
Closing number of shares 1 1 1
BHP Group Plc [member] | 5.5% Preference shares [member]      
Share capital issued      
Opening number of shares 50,000 50,000  
Closing number of shares 50,000 50,000 50,000