Property, Plant and Equipment - Summary of Principal Depreciation Methods and Rates Applied to Major Asset Categories (Detail)
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12 Months Ended |
Jun. 30, 2021 |
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| Buildings [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Typical depreciation methodology |
SL
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| Buildings [member] | Bottom of range [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Depreciation rate |
25 years
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| Buildings [member] | Top of range [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Depreciation rate |
50 years
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| Plant and equipment [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
|
| Typical depreciation methodology |
SL
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| Plant and equipment [member] | Bottom of range [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Depreciation rate |
3 years
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| Plant and equipment [member] | Top of range [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Depreciation rate |
30 years
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| Mineral rights and petroleum interests [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Typical depreciation methodology |
UoP
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| Depreciation rate |
Based on the rate of depletion of reserves
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| Capitalised exploration, evaluation and development expenditure [member] |
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| Disclosure of detailed information about property, plant and equipment [line items] |
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| Typical depreciation methodology |
UoP
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| Depreciation rate |
Based on the rate of depletion of reserves
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