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 |
|---|---|---|---|---|
| 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 |