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Share Capital - Summary of Share Capital (Detail) - shares
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
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 3,211,691,105 3,211,691,105
Purchase of shares by ESOP Trusts (5,975,189) (6,854,057) (7,469,236)
Employee share awards exercised following vesting 6,893,113 5,902,588 7,339,522
Movement in treasury shares under Employee Share Plans (917,924) 951,469 129,714
Share bought back and cancelled   (265,839,711)  
Closing number of shares 2,945,851,394 2,945,851,394 3,211,691,105
BHP Group Limited [member] | Shares held by the public [member]      
Share capital issued      
Opening number of shares 2,944,703,079 3,211,494,259  
Closing number of shares 2,945,621,003 2,944,703,079 3,211,494,259
BHP Group Limited [member] | Treasury shares [member]      
Share capital issued      
Opening number of shares 1,148,315 196,846  
Closing number of shares 230,391 1,148,315 196,846
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 (185,297) (274,069) (679,223)
Employee share awards exercised following vesting 222,245 275,984 711,705
Movement in treasury shares under Employee Share Plans (36,948) (1,915) (32,482)
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 2,112,032,077 2,112,030,162  
Closing number of shares 2,112,069,025 2,112,032,077 2,112,030,162
BHP Group Plc [member] | Treasury shares [member]      
Share capital issued      
Opening number of shares 39,719 41,634  
Closing number of shares 2,771 39,719 41,634
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