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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of exceptional items [line items]      
Exceptional items gross $ (340) $ (620) $ (4,423)
Exceptional items tax (266) (454) (1,057)
Exceptional items net (606) (1,074) (5,480)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (340) (1,032) (1,087)
Exceptional items tax 17 (31) (71)
Exceptional items net (323) (1,063) (1,158)
Chilean Tax Reform [Member]      
Disclosure of exceptional items [line items]      
Exceptional items tax (283)    
Exceptional items net (283)    
Impairment of US deferred tax assets [Member]      
Disclosure of exceptional items [line items]      
Exceptional items tax   (423)  
Exceptional items net   (423)  
Corporate structure unification costs [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross   (428)  
Exceptional items net   (428)  
BHP Mitsui Coal (BMC) gain on disposal [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross   840  
Exceptional items net   840  
COVID-19 related costs [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (499)
Exceptional items tax     138
Exceptional items net     (361)
Impairment of Energy coal assets [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (1,523)
Exceptional items tax     (651)
Exceptional items net     (2,174)
Impairment of Potash assets [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (1,314)
Exceptional items tax     (473)
Exceptional items net     (1,787)
Attributable to non-controlling interests [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (34)
Exceptional items tax (107)   10
Exceptional items net (107)   (24)
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (340) (620) (4,389)
Exceptional items tax (159) (454) (1,067)
Exceptional items net $ (499) $ (1,074) $ (5,456)