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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 2,606 $ 1,390
Input taxes receivable 478 367
Input taxes payable 145 162
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 296 309
Significant financial instruments [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Net assets fair value 180 202
Financial assets 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 179 200
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 87 128
Financial assets held at fair value through profit or loss [member] | Non-current other investments [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 47 $ 47