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Dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 17, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of dividends [line items] |  |  |  |
Tax rate |  | 30.00% | 30.00% | 30.00%
Proceeds/(settlements) of cash management related instruments |  | $ (401) | $ 85 | $ 296
Major ordinary share transactions [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Dividend per share, after period-end | $ 2 |  | $ 0.55 | $ 0.78
Dividend amount, after period-end | $ 10,114 |  | $ 2,782 | $ 3,944
Proceeds/(settlements) of cash management related instruments |  | $ 8 |  |
BHP Group Limited [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |
Tax rate |  | 30.00% |  |
BHP Group Plc [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |

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