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Segment Reporting - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2021 USD ($) Segment | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Disclosure of operating segments [line items] |  |  |
Number of reportable segment | Segment | 4 |  |
Goodwill | $ 1,197 | $ 1,197 |
Operating segments [member] | Copper [Member] | Restated balance [member] | Olympic Dam [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Goodwill |  | 950 | $ 950
Material reconciling items [member] | Restated balance [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Deferred tax liabilities |  | $ 1,021 | $ 1,021

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