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Impairment of Non-current Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
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 6.50% 6.00%
Amount by which unit's recoverable amount exceeds its carrying amount $ 2,400 $ 1,800
Goodwill $ 1,010 $ 1,010
Production volume decrease 6.00% 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%