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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [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)
Attributable to BHP shareholders [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [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)
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) (177)
Exceptional items tax   138 51
Exceptional items net   (361) (126)
Discontinued operations [member]      
Disclosure In Tabular Form Of Exceptional Items Relating To Discontinued Operations [Line Items]      
Exceptional items gross 8,167 (47) (6)
Exceptional items tax (8) (270) 2
Exceptional items net 8,159 (317) (4)
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) (6)
Exceptional items tax (8) (270) 2
Exceptional items net $ 8,159 (317) (4)
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) (6)
Exceptional items tax   8 2
Exceptional items net   $ (39) $ (4)