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Discontinued Operations - Summary of Income Statement - Discontinued Operations (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of analysis of single amount of discontinued operations [line items]    
Profit/(loss) after taxation $ 10,655 $ (225)
Discontinued operations [member]    
Disclosure of analysis of single amount of discontinued operations [line items]    
Profit/(loss) after taxation from operating activities 2,496 (225)
Net gain on Petroleum merger with Woodside (after tax) 8,159  
Profit/(loss) after taxation 10,655 (225)
Attributable to non-controlling interests 0  
Attributable to BHP shareholders $ 10,655 $ (225)
Basic earnings/(loss) per ordinary share (cents) $ 2.105 $ (0.045)
Diluted earnings/(loss) per ordinary share (cents) $ 2.101 $ (0.045)