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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 1,431 $ 1,840
Input taxes receivable 427 486
Input taxes payable 79 176
Other receivables 233 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 252 260
Financial assets and liabilities held at fair value through profit or loss [member] | Other derivative contracts [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets and liabilities 0 121
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 $ 119 $ 72