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New and Amended Accounting Standards and Interpretations - Summary of Impact of Adopting IFRS 9 on Total Equity (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | --- | --- | ---
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Equity | $ 51,824 |  | $ 60,670 | $ 62,726 | $ 60,071
Impact of adopting IFRS 9 [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Impairment provision resulting from application of the Expected Credit Loss model | $ (7) | $ (7) |  |  |
Restated balance [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Equity |  | $ 60,663 | $ 60,663 |  |

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