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Share Capital - Summary of Share Capital (Detail) - shares | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
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 | 3,211,691,105 | 3,211,691,105 | 3,211,691,105
Purchase of shares by ESOP Trusts | (6,854,057) | (7,469,236) | (6,481,292)
Employee share awards exercised following vesting | 5,902,588 | 7,339,522 | 6,945,570
Movement in treasury shares under Employee Share Plans | 951,469 | 129,714 | (464,278)
Share bought back and cancelled | (265,839,711) |  |
Closing number of shares | 2,945,851,394 | 3,211,691,105 | 3,211,691,105
BHP Group Limited [member] | Shares held by the public [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 3,211,494,259 | 3,211,623,973 |
Closing number of shares | 2,944,703,079 | 3,211,494,259 | 3,211,623,973
BHP Group Limited [member] | Treasury shares [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 196,846 | 67,132 |
Closing number of shares | 1,148,315 | 196,846 | 67,132
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 | (274,069) | (679,223) | (225,646)
Employee share awards exercised following vesting | 275,984 | 711,705 | 940,070
Movement in treasury shares under Employee Share Plans | (1,915) | (32,482) | (714,424)
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 | 2,112,030,162 | 2,111,997,680 |
Closing number of shares | 2,112,032,077 | 2,112,030,162 | 2,111,997,680
BHP Group Plc [member] | Treasury shares [member] |  |  |
Share capital issued |  |  |
Opening number of shares | 41,634 | 74,116 |
Closing number of shares | 39,719 | 41,634 | 74,116
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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