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Property, Plant and Equipment - Summary of Principal Depreciation Methods and Rates Applied to Major Asset Categories (Detail)
12 Months Ended
Jun. 30, 2018
Buildings [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Typical depreciation methodology SL
Buildings [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Depreciation rate 25 years
Buildings [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Depreciation rate 50 years
Plant and equipment [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Typical depreciation methodology SL
Plant and equipment [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Depreciation rate 3 years
Plant and equipment [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Depreciation rate 30 years
Other mineral assets [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Typical depreciation methodology UoP
Depreciation rate Based on the rate of depletion of reserves
Capitalised exploration, evaluation and development expenditure [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Typical depreciation methodology UoP
Depreciation rate Based on the rate of depletion of reserves