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Share Capital - Summary of Share Capital (Parenthetical) (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2021 $ / shares shares | Jun. 30, 2020 $ / shares | Jun. 30, 2019 USD ($) $ / shares | Sep. 02, 2021 shares | Jun. 30, 2021 £ / shares shares | Jun. 30, 2020 £ / shares | Jun. 30, 2019 £ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Off-market buy-back program | $ | $ 5,200 |  |  | $ 5,220 |  |  |  |
BHP Group Limited [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Par value |  | $ 0.50 |  |  |  |  |  |
BHP Group Limited [member] | Major ordinary share transactions [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of ordinary shares issued on the exercise of awards | shares |  |  |  |  | 4,400,000 |  |  |
BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Par value |  | 0.50 |  |  |  |  |  |
Special Voting share of US$0.50 par value [member] | BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Par value |  | $ 0.50 | $ 0.50 | $ 0.50 |  |  |  |
Number of ordinary shares issued on the exercise of awards | shares |  | 1 |  |  |  | 1 |  |
5.5% Preference shares [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Par value | £ / shares |  |  |  |  |  | £ 1 | £ 1 | £ 1
Dividend rate percentage |  | 5.50% | 5.50% | 5.50% |  |  |  |
5.5% Preference shares [member] | BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Par value | £ / shares |  |  |  |  |  | £ 1 | £ 1 | £ 1
Dividend rate percentage |  | 5.50% | 5.50% | 5.50% |  |  |  |

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