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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 1,585 $ 1,431
Input taxes receivable 531 427
Input taxes payable 121 79
Other receivables 246 233
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 290 252
Net other derivatives [member] | Level 3 [member] | Power purchase contract agreements [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 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 $ 138 $ 119