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New And Amended Accounting Standards And Interpretations And Changes To Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 01, 2019 | Jul. 01, 2018
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Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Retained earnings | $ (46,779) | $ (43,396) |  |
IAS Twelve [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Retained earnings |  |  | $ 71 | $ 71

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