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Financial Risk Management - Summary of Financial Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Other financial assets | $ 1,319 | $ 1,390
Input taxes receivable | 464 | 367
Input taxes payable | 110 | 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 | 303 | 309
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 | 219 | 200
Significant financial instruments [member] | Level 3 [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net assets fair value | 220 | 202
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 | 121 | 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 | $ 46 | $ 47

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