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Closure and Rehabilitation Provisions - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Bhp Mitsubishi Alliance [Member]      
Disclosure of other provisions [line items]      
Increase decrease In closure provision $ 750    
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 decrease in real discount rates $ 675    
Decrease in depreciation expense due to reasonably possible decrease in real discount rates 70    
Increase 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 $ 185    
Closure and rehabilitation provisions [member] | Bottom of range [member]      
Disclosure of other provisions [line items]      
Remaining production life 2 years 3 years  
Closure and rehabilitation provisions [member] | Top of range [member]      
Disclosure of other provisions [line items]      
Remaining production life 104 years 91 years  
Closure and rehabilitation provisions [member] | Weighted average [member]      
Disclosure of other provisions [line items]      
Remaining production life 29 years 27 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 $ 74 $ 483 $ 669
Decrease in income statement charge due to reasonably possible decrease in real discount rates 185    
Increase decrease ​in income statement charge due​ to reasonable possible acceleration​ in forecast ​of cash​ flows 60    
Closure and rehabilitation provisions [member] | Operating sites [member]      
Disclosure of other provisions [line items]      
Decrease in property, plant and equipment due to reasonably possible decrease in real discount rates 490    
Increase in property, plant and equipment due to reasonably possible acceleration in forecast cash flows 125    
Cerro Colorado [Member]      
Disclosure of other provisions [line items]      
Increase decrease In closure provision $ 400