Pension and Other Post-retirement Obligations - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Disclosure of defined contribution plans [abstract] | |||
| Contributions paid | $ 334 | $ 260 | $ 274 |