v3.26.1
Impairment of Non-current Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill $ 1,341 $ 1,341
Material impairment loss   0
Asset Impairment Loss 2,408 261
Jansen Project [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Asset Impairment Loss $ 2,300  
Jansen [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Discount rate applied to cash flow projections 7.00%  
Recoverable amount of asset or cash-generating unit $ 8,800  
Asset Impairment Loss 2,300  
Other Cash Generating Units [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill 187 187
Goodwill impairment loss $ 0 $ 0
Other Cash Generating Units [Member] | Top of range [member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Percentage of goodwill included in net assets 1.00% 1.00%
Copper SA [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Discount rate applied to cash flow projections 7.00% 7.00%
Amount by which unit's recoverable amount exceeds its carrying amount $ 6,600 $ 10,500
Goodwill 1,154 $ 1,154
Copper SA [Member] | OZ Minerals Limited [member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill 144  
Copper SA [Member] | WMC Resources Ltd [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill $ 1,010