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Discontinued Operations - Summary of Income Statement - Discontinued Operations (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
Disclosure of analysis of single amount of discontinued operations [line items]  
Profit/(loss) after taxation $ 10,655
Discontinued operations [member]  
Disclosure of analysis of single amount of discontinued operations [line items]  
Profit/(loss) after taxation from operating activities 2,496
Net gain on Petroleum merger with Woodside (after tax) 8,159
Profit/(loss) after taxation 10,655
Attributable to non-controlling interests 0
Attributable to BHP shareholders $ 10,655
Basic earnings/(loss) per ordinary share (cents) | $ / shares $ 2.105
Diluted earnings/(loss) per ordinary share (cents) | $ / shares $ 2.101