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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

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