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Dividends - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 18, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of dividends [line items] |  |  |  |
Dividend per share, after period-end |  |  | $ 0.55 | $ 0.78
Dividend amount, after period-end |  |  | $ 2,788 | $ 3,946
Shares in BHP Group Limited that were held by BHP Group Plc |  | 0 | 0 | 0
Major ordinary share transactions [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Dividend per share, after period-end | $ 0.65 |  |  |
Dividend amount, after period-end | $ 3,287 |  |  |
BHP Group Limited [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |
Ordinary shares on issue and held by the public |  | 2,945,000,000 |  |
Tax rate |  | 30.00% |  |
BHP Group Plc [member] |  |  |  |
Disclosure of dividends [line items] |  |  |  |
Number of ordinary shares represented by each American Depositary Share |  | 2 |  |
Ordinary shares on issue and held by the public |  | 2,112,000,000 |  |

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