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Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
May 03, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of exceptional items [line items]        
Exceptional items net   $ 1,074 $ 5,480 $ 1,301
BHP Mitsui Coal Pty Ltd [member]        
Disclosure of exceptional items [line items]        
Group's interest     80.00%  
Samarco dam failure [member]        
Disclosure of exceptional items [line items]        
Exceptional items net   1,063 $ 1,158 176
Cerro Colorado impairment [Member]        
Disclosure of exceptional items [line items]        
Exceptional items net       $ 492
Current environmental licence, Expiry date       CY2023
New South Wales Energy Coal [member]        
Disclosure of exceptional items [line items]        
Exceptional items net     1,704  
Cerrejón [Member]        
Disclosure of exceptional items [line items]        
Exceptional items net     470  
Impairment of Potash assets [Member]        
Disclosure of exceptional items [line items]        
Exceptional items net     $ 1,787  
Impairment of US Deferred Tax Assets [Member]        
Disclosure of exceptional items [line items]        
Exceptional items net   423    
BHP Mitsui Coal or BMC Gain on Disposal [Member]        
Disclosure of exceptional items [line items]        
Exceptional items net   $ (840)    
BHP Mitsui Coal or BMC Gain on Disposal [Member] | BHP Mitsui Coal Pty Ltd [member]        
Disclosure of exceptional items [line items]        
Cash flows from losing control of subsidiaries or other businesses $ 1,100      
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment 218      
Deferred Consideration receivable on divestiture of interest in a subsidiary 100      
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary $ 150      
Group's interest 80.00%      
Cash due period 6 months      
Price linked earn out payable year   2024 calendar year    
Deferred Price Linked Earnout Discounted on Divestiture of Interest in a Subsidiary $ 122