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Impairment of Non-current Assets - Summary of Impairment of Non-current Assets Excluding Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items]      
Total impairment of non-current assets $ 2,635 $ 494 $ 264
New South Wales Energy Coal [Member]      
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items]      
Negative recoverable​ amount​ of asset​ or cash generating​ unit (300)    
Total impairment of non-current assets $ 1,057    
Discount rate applied 6.50%    
Cerrejon [Member]      
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items]      
Recoverable amount of asset or cash-generating unit $ 284    
Total impairment of non-current assets 466    
Consideration on sale of investments accounted for using equity method 294    
Expected Net Proceeds From Sale Of Investments Accounted For Using Equity Method 284    
Potash [Member]      
Disclosure of detailed information about impairment of non-current assets excluding goodwill [line items]      
Recoverable amount of asset or cash-generating unit 3,300    
Total impairment of non-current assets $ 1,300    
Discount rate applied 6.50%