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Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
May 17, 2023
May 03, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Nov. 03, 2022
Disclosure of exceptional items [line items]            
Exceptional items net     $ 606 $ 1,074 $ 5,480  
Chilean tax reform [member]            
Disclosure of exceptional items [line items]            
Exceptional items net     283      
Tax rate royalty on revenue 1.00%          
Tax Rate Effect Of Revenues Exempt From Taxation 46.50%          
Deferred tax position remeasured     283      
Chilean tax reform [member] | Bottom of range [member]            
Disclosure of exceptional items [line items]            
Tax rate royalty on margin 8.00%          
Chilean tax reform [member] | Top of range [member]            
Disclosure of exceptional items [line items]            
Tax rate royalty on margin 26.00%          
Samarco dam failure [member]            
Disclosure of exceptional items [line items]            
Exceptional items net     $ 323 1,063 1,158  
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 received 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%        
Price linked earn out payable year       2024 calendar year    
Deferred Price Linked Earnout Discounted on Divestiture of Interest in a Subsidiary   $ 122        
Deferred consideration   $ 222   $ 222