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Share Capital - Summary of Share Capital (Detail) - shares
 12 Months Ended
Jan. 31, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
BHP Group Limited [member]        
Share capital issued        
Opening number of shares   5,065,820,556 5,062,323,190 2,945,851,394
Issue of shares   5,710,261 3,497,366 4,400,000
Corporate structure unification 2,112,071,796 0   2,112,071,796
Purchase of shares by ESOP Trusts   (5,687,667) (6,442,571) (8,704,669)
Employee share awards exercised following vesting   5,841,767 6,081,843 8,522,684
Movement in treasury shares under Employee Share Plans   (154,100) 360,728 181,985
Closing number of shares   5,071,530,817 5,065,820,556 5,062,323,190
BHP Group Limited [member] | Shares held by the public [member]        
Share capital issued        
Opening number of shares   5,064,408,782 5,061,272,144  
Closing number of shares   5,070,273,143 5,064,408,782 5,061,272,144
BHP Group Limited [member] | Treasury shares [member]        
Share capital issued        
Opening number of shares   1,411,774 1,051,046  
Closing number of shares   1,257,674 1,411,774 1,051,046
BHP Group Plc [member]        
Share capital issued        
Opening number of shares       2,112,071,796
Corporate structure unification       (2,112,071,796)
Purchase of shares by ESOP Trusts       (63,567)
Employee share awards exercised following vesting       77,748
Movement in treasury shares under Employee Share Plans       (14,181)