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Share Capital - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 17, 2021 USD ($) | Sep. 16, 2020 USD ($) | Jun. 30, 2021 $ / shares shares | Jun. 30, 2021 £ / shares shares | Jun. 30, 2020 $ / shares | Jun. 30, 2020 £ / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2019 £ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Ordinary shares, per cent of total number of shares |  |  | 99.99% | 99.99% |  |  |  |
BHP Group Limited [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.50 |  |  |  |  |
BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.50 |  |  |  |  |
Special Voting share of no par value [member] | BHP Group Limited [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares issued |  |  | 1 | 1 |  |  |  |
Movement in shares |  |  | 0 |  |  |  |  |
Special Voting share of US$0.50 par value [member] | BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 0.50 |  | $ 0.50 |  | $ 0.50 |
Number of shares issued |  |  | 1 | 1 |  |  |  |
Movement in shares |  |  | 0 |  |  |  |  |
5.5% Preference shares [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | £ / shares |  |  |  | £ 1 |  | £ 1 |  | £ 1
5.5% Preference shares [member] | BHP Group Plc [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | £ / shares |  |  |  | £ 1 |  | £ 1 |  | £ 1
Movement in shares |  |  | 0 |  |  |  |  |
DLC Dividend share [member] | BHP Group Limited [member] |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Shares, par value | $ / shares |  |  | $ 10 |  |  |  |  |
Dividends paid under DLC dividend share arrangements | $ | $ 1,610 | $ 1,915 |  |  |  |  |  |

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