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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of detailed information about financial instruments [line items] |  |
Other financial assets | $ 1,840 | $ 2,606
Input taxes receivable | 486 | 478
Input taxes payable | 176 | 145
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 | 260 | 296
Significant financial instruments [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net assets fair value | 121 | 180
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 | 121 | 179
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 | 72 | 87
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 | $ 46 | $ 47

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