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Financial Risk Management - Summary of Foreign Currency Risk Arising From Financial Assets and Liabilities, Which Are Denominated In Currencies Other Than The US Dollar (Detail) - Currency risk [member] - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | $ (4,041) | $ (2,968)
Australian dollars |  |
Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | (4,421) | (3,788)
Chilean peso |  |
Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | (649) | (369)
British pond sterling |  |
Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | 535 | 587
Euro |  |
Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | 366 | 619
Other |  |
Disclosure of Detailed Information about Foreign Currency Risk Arising from Financial Assets and Liabilities which are Denominated in Currencies other than the US Dollar Explanatory [Line Items] |  |
Net Financial Assets Liabilities | $ 128 | $ (17)

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