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Closure and Rehabilitation Provisions - Additional Information (Detail) - Closure and rehabilitation provisions [member] - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of other provisions [line items] |  |  |  |
Percentage of reasonably possible decrease in real discount rates |  | 0.50% |  |
Increase decrease in provision due to change in discount rate |  | $ 675 |  |
Increase in closure and rehabilitation provision due to reasonably possible decrease in real discount rates |  | $ 772 |  |
Increase in depreciation expense due to reasonably possible decrease in real discount rates | $ 35 |  |  |
Decrease in net finance costs due to reasonably possible decrease in real discount rates | $ 16 |  |  |
Bottom of range [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Remaining production life |  | 4 years |  |
Top of range [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Remaining production life |  | 91 years |  |
Weighted average [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Remaining production life |  | 28 years |  |
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 |  | $ 669 | $ 251 | $ (21)
Increase decrease in provision due to change in discount rate |  | 90 |  |
Increase in income statement charge due to reasonably possible decrease in real discount rates |  | 166 |  |
Operating sites [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Increase in property, plant and equipment due to reasonably possible decrease in real discount rates |  | $ 606 |  |

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- Details
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- Details
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- Details
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