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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
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)