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Earnings Per Share - Summary of Reconciliation of Earnings Attributable to Ordinary Shareholders (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Earnings per share [line items]      
Earnings attributable to BHP shareholders $ 7,897 $ 12,921 $ 30,900
(Gain)/loss on sales of property, plant and equipment, intangibles and investments (29) (9) (95)
Impairments of property, plant and equipment and intangibles 3,905 75 515
Gain on disposal of subsidiaries and operations (915)   (840)
Exceptional items gross 6,600 340 620
Tax effect of above adjustments (928) (17) (97)
Subtotal of adjustments 2,033 49 (8,684)
Headline earnings 9,930 12,970 22,216
Diluted headline earnings $ 9,930 $ 12,970 22,216
Discontinued operations [member]      
Earnings per share [line items]      
Exceptional items gross     (8,167)
Gain On Petroleum Disposal [Member] | Discontinued operations [member]      
Earnings per share [line items]      
Exceptional items gross     $ (8,167)