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Closure and Rehabilitation Provisions - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
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 $ 758    
Decrease in depreciation expense due to reasonably possible increase in real discount rates 44    
Increase in net finance costs due to reasonably possible increase in real discount rates 26    
Increase in Provision due to reasonably possible acceleration in forecast cash flows $ 209    
Closure and rehabilitation provisions [member] | After Thirty Years [Member]      
Disclosure of other provisions [line items]      
Proportion of the entity undiscounted forecast cashflows 51.00% 48.00%  
Closure and rehabilitation provisions [member] | Bottom of range [member]      
Disclosure of other provisions [line items]      
Remaining production life 1 year 2 years  
Closure and rehabilitation provisions [member] | Top of range [member]      
Disclosure of other provisions [line items]      
Remaining production life 103 years 104 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 $ 4 $ 74 $ 483
Decrease in income statement charge due to reasonably possible increase in real discount rates 190    
Increase decrease ​in income statement charge due​ to reasonable possible acceleration​ in forecast ​of cash​ flows 61    
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 568    
Increase in property, plant and equipment due to reasonably possible acceleration in forecast cash flows $ 148