v3.26.1
Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 02, 2024
Jun. 30, 2026
Jun. 30, 2025
Disclosure of detailed information about financial instruments [line items]      
Investments held which are restricted and not available for general use by the Group   $ 55 $ 0
Other financial assets   1,530 1,683
Input taxes receivable   518 477
Other financial liabilities   5,923 1,578
Input taxes payable   88 90
Contingent consideration receivables   131 0
Samarco Dam Failure [member] | Senior Note [Member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   156 147
Blackwater and Daunia gain on divestment [member]      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration receivables   67 122
Deferred consideration divestiture of interest in a subsidiary $ 1,100 48 280
Streaming Agreement [Member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities   4,273 0
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   62 176
Escondida [member] | Power Purchase Contract Cancellation [Member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities   308 378
Net other derivatives [member] | Level 3 [member] | Power purchase contract agreements [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets   49 37
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   $ 37 $ 105