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Share Capital - Summary of Share Capital (Detail) - shares | 12 Months Ended
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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

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