Financial Risk Management - Summary of Carrying Amounts of Group's Notes and Debentures by Currency and Derivatives Which Hedge (Parenthetical) (Detail) - USD ($) $ in Millions |
Jun. 30, 2021 |
Jun. 30, 2020 |
|---|---|---|
| Disclosure of detailed information about hedged items [line items] | ||
| Borrowings | $ 17,087 | $ 23,605 |
| Fixed interest rate not swapped to floating rate [member] | ||
| Disclosure of detailed information about hedged items [line items] | ||
| Borrowings | $ 3,018 | $ 3,019 |