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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