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New And Amended Accounting Standards And Interpretations And Changes To Accounting Policies - Summary of Retrospective Application of The Accounting Policy Change Has Resulted In The Adjustments in Consolidated Balance sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 01, 2019 | Jul. 01, 2018
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Disclosure Of Detailed Information Of Retrospective Application Of Accounting Policy Change IAS Twelve [Line Items] |  |  |  |
Increase in Deferred tax liabilities | $ 3,314 | $ 3,779 |  |
Increase in Goodwill (included within Intangible assets) | 1,197 | 1,197 |  |
Decrease in Retained earnings | $ 46,779 | $ 43,396 |  |
IAS Twelve [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure Of Detailed Information Of Retrospective Application Of Accounting Policy Change IAS Twelve [Line Items] |  |  |  |
Increase in Deferred tax liabilities |  |  | $ 1,021 |
Increase in Goodwill (included within Intangible assets) |  |  | 950 |
Decrease in Retained earnings |  |  | $ (71) | $ (71)

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