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Impairment of Non-current Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Goodwill $ 1,197 $ 1,197
Olympic Dam [member]    
Disclosure of detailed information about impairment of noncurrent assets [Line items]    
Discount rate applied 6.00%  
Amount by which unit's recoverable amount exceeds its carrying amount $ 1,800  
Goodwill $ 1,010 1,010
Production volume decrease 4.80%  
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%