v3.25.2
Impairment of Non-current Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill $ 1,341 $ 1,341
Material impairment loss 0  
Western Australia Nickel [Member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Discount rate applied   7.50%
Recoverable amount of asset or cash-generating unit   $ 600
Impairment charges on property plant and equipment   3,744
Impairment charges on intangible assets   56
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]    
Amount by which unit's recoverable amount exceeds its carrying amount $ 10,500 $ 8,400
Goodwill $ 1,154 $ 1,154
Production volume decrease 7.00% 7.00%
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