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Closure and Rehabilitation Provisions - Additional Information (Detail) - Closure and rehabilitation provisions [member] - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of other provisions [line items]        
Percentage of reasonably possible decrease in real discount rates   0.50%    
Reasonably possible acceleration in forecast cash flows   1 year    
Increase decrease in provision due to change in discount rate   $ 1,085    
Increase in closure and rehabilitation provision due to reasonably possible decrease in real discount rates   1,075    
Increase in depreciation expense due to reasonably possible decrease in real discount rates $ 115      
Decrease in net finance costs due to reasonably possible decrease in real discount rates $ 25      
Increase in Provision due to reasonably possible acceleration in forecast cash flows   $ 230    
Bottom of range [member]        
Disclosure of other provisions [line items]        
Remaining production life   3 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   27 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   $ 483 $ 669 $ 251
Increase decrease in provision due to change in discount rate   210    
Increase in income statement charge due to reasonably possible decrease in real discount rates   255    
Decrease increase ​in income statement charge due​ to reasonable possible acceleration​ in forecast ​of cash​ flows   50    
Operating sites [member]        
Disclosure of other provisions [line items]        
Increase in property, plant and equipment due to reasonably possible decrease in real discount rates   820    
Increase in property, plant and equipment due to reasonably possible acceleration in forecast cash flows   $ 180