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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of exceptional items [line items]      
Exceptional items gross $ (620) $ (4,423) $ (1,540)
Exceptional items tax (454) (1,057) 239
Exceptional items net (1,074) (5,480) (1,301)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (1,032) (1,087) (176)
Exceptional items tax (31) (71)  
Exceptional items net (1,063) (1,158) (176)
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 0 0
Exceptional items net 840    
Cancellation Of Power Contracts [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (778)
Exceptional items tax     271
Exceptional items net     (507)
COVID-19 related costs [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross   (499) (177)
Exceptional items tax   138 51
Exceptional items net   (361) (126)
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)  
Cerro Colorado impairment [Member]      
Disclosure of exceptional items [line items]      
Exceptional items gross     (409)
Exceptional items tax     (83)
Exceptional items net     (492)
Attributable to non-controlling interests [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross   (34) (291)
Exceptional items tax   10 90
Exceptional items net   (24) (201)
Attributable to BHP shareholders [member]      
Disclosure of exceptional items [line items]      
Exceptional items gross (620) (4,389) (1,249)
Exceptional items tax (454) (1,067) 149
Exceptional items net $ (1,074) $ (5,456) $ (1,100)