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Closure and Rehabilitation Provisions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Disclosure of other provisions [line items] |  |  |
Proportion of the entity undiscounted forecast cashflows | 100.00% | 100.00% |
Closure and rehabilitation provisions [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Reasonably possible acceleration in forecast cash flows | 1 year |  |
Percentage of reasonably possible increase in real discount rates | 0.50% |  |
Decrease in closure and rehabilitation provision due to reasonably possible increase in real discount rates | $ 665 |  |
Decrease in depreciation expense due to reasonably possible increase in real discount rates | 23 |  |
Increase in net finance costs due to reasonably possible increase in real discount rates | 21 |  |
Increase in Provision due to reasonably possible acceleration in forecast cash flows | 231 |  |
Increase decrease in provision due to changes in discount rate | $ 336 |  |
Closure and rehabilitation provisions [member] | After Thirty Years [Member] |  |  |
Disclosure of other provisions [line items] |  |  |
Proportion of the entity undiscounted forecast cashflows | 52.00% | 51.00% |
Closure and rehabilitation provisions [member] | Bottom of range [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Remaining production life | 5 years | 1 year |
Closure and rehabilitation provisions [member] | Top of range [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Remaining production life | 87 years | 103 years |
Closure and rehabilitation provisions [member] | Closed sites [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Increases to existing and new provisions associated closure and remediation costs charged to the income statement | $ 38 | $ 4 | $ 74
Decrease in income statement charge due to reasonably possible increase in real discount rates | 208 |  |
Increase decrease ​in income statement charge due​ to reasonable possible acceleration​ in forecast ​of cash​ flows | 83 |  |
Increase decrease in provision due to changes in discount rate | 167 |  |
Closure and rehabilitation provisions [member] | Operating sites [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Decrease in property, plant and equipment due to reasonably possible increase in real discount rates | 457 |  |
Increase in property, plant and equipment due to reasonably possible acceleration in forecast cash flows | $ 148 |  |

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- Details
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