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Share Capital - Additional Information (Detail) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 $ / shares shares | Jun. 30, 2020 £ / shares shares | Jun. 30, 2019 $ / shares | Jun. 30, 2019 £ / shares | Jun. 30, 2018 $ / shares | Jun. 30, 2018 £ / shares | Feb. 23, 2016 $ / 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

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