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Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 02, 2024
Oct. 18, 2023
May 17, 2023
May 03, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Nov. 03, 2022
Disclosure of exceptional items [line items]                
Exceptional items net         $ 5,763.0 $ 606.0 $ 1,074.0  
Portion of consideration paid (received) consisting of cash and cash equivalents             683.0  
Impairment of Western Australia Nickel assets [member]                
Disclosure of exceptional items [line items]                
Exceptional items net         2,675.0      
Chilean tax reform [member]                
Disclosure of exceptional items [line items]                
Exceptional items net           283.0    
Tax rate royalty on revenue     1.00%          
Tax Rate Effect Of Revenues Exempt From Taxation     46.50%          
Deferred tax position remeasured           283.0    
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         3,762.0 $ 323.0 1,063.0  
Impairment of US Deferred Tax Assets [Member]                
Disclosure of exceptional items [line items]                
Exceptional items net             423.0  
Blackwater and Daunia gain on divestment [member]                
Disclosure of exceptional items [line items]                
Exceptional items net         (674.0)      
Cash flows from losing control of subsidiaries or other businesses $ 2,000.0              
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment 44.1              
Deferred consideration $ 1,100.0       495.0      
Proportion of ownership interest in joint venture 50.00%              
Bma percentage basis 100.00%              
Deposit on signing of the asset sale agreement   $ 100.0            
Deferred consideration term 3 years              
Price linked earnout amount receivable term 3 years              
Price linked earnout subject to cap value $ 350.0              
Average realized pricing exeeding agreed thresholds term 3 years              
Portion of consideration paid (received) consisting of cash and cash equivalents $ 4,100.0       $ 1,072.0      
Blackwater and Daunia gain on divestment [member] | Top of range [member]                
Disclosure of exceptional items [line items]                
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary $ 900.0              
BHP Mitsui Coal or BMC Gain on Disposal [Member]                
Disclosure of exceptional items [line items]                
Exceptional items net             $ (840.0)  
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       $ 1,100.0        
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment       218.0        
Deferred consideration received on divestiture of interest in a subsidiary               $ 100.0
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary       $ 150.0        
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       $ 122.0        
Deferred consideration       $ 222.0     $ 222.0  
Portion of consideration paid (received) consisting of cash and cash equivalents             $ 1,318.0