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Discontinued Operations - Summary of Tabular Form Of Exceptional Items Relating to Discontinued Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross $ (6,600) $ (340) $ (620)
Exceptional items tax 837 (266) (454)
Exceptional items net (5,763) (606) (1,074)
Attributable to BHP shareholders [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross (6,600) (340) (620)
Exceptional items tax 837 (159) (454)
Exceptional items net (5,763) (499) (1,074)
Discontinued operations [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     8,167
Exceptional items tax     (8)
Exceptional items net $ 0 $ 0 8,159
Discontinued operations [member] | Gain on Petroleum disposal [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     8,167
Exceptional items tax     (8)
Exceptional items net     8,159
Discontinued operations [member] | Attributable to BHP shareholders [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     8,167
Exceptional items tax     (8)
Exceptional items net     $ 8,159