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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 02, 2024
Jun. 30, 2024
Jun. 30, 2023
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   $ 1,610 $ 1,585
Input taxes receivable   492 531
Input taxes payable   101 121
Other receivables   195 246
Samarco Dam Failure [member] | Senior Note [Member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   137  
Blackwater and Daunia gain on divestment [member]      
Disclosure of detailed information about financial instruments [line items]      
Deferred consideration divestiture of interest in a subsidiary $ 1,100 495  
BHP Foundation [member]      
Disclosure of detailed information about financial instruments [line items]      
Investments held which are restricted and not available for general use by the Group   243 290
Net other derivatives [member] | Level 3 [member] | Power purchase contract agreements [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   92 46
Financial assets held at fair value through profit or loss [member] | US Treasury Notes [member] | Level 1 [member] | BHP Foundation [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   $ 134 $ 138