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

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