Segment Reporting - Summary of Geographical Information (Parenthetical) (Detail) - USD ($) $ in Millions |
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|---|---|---|---|
| Statement [Line Items] | |||
| Goodwill | $ 1,197 | $ 1,197 | |
| Increase (decrease) due to changes in accounting policy required by IFRSs [member] | Olympic Dam [member] | |||
| Statement [Line Items] | |||
| Goodwill | $ 950 | $ 950 |