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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, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross $ (340) $ (620) $ (4,423)
Exceptional items tax (266) (454) (1,057)
Exceptional items net (606) (1,074) (5,480)
Attributable to BHP shareholders [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross (340) (620) (4,389)
Exceptional items tax (159) (454) (1,067)
Exceptional items net (499) (1,074) (5,456)
Impairment of Potash assets [Member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     (1,314)
Exceptional items tax     (473)
Exceptional items net     (1,787)
COVID-19 related costs [Member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     (499)
Exceptional items tax     138
Exceptional items net     (361)
Discontinued operations [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross   8,167 (47)
Exceptional items tax   (8) (270)
Exceptional items net $ 0 8,159 (317)
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 (47)
Exceptional items tax   (8) (270)
Exceptional items net   $ 8,159 (317)
Discontinued operations [member] | Impairment of Potash assets [Member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items tax     (278)
Exceptional items net     (278)
Discontinued operations [member] | COVID-19 related costs [Member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross     (47)
Exceptional items tax     8
Exceptional items net     $ (39)