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Impairment of Non-current Assets - Schedule of Impairment of Non-current Assets for Cash Generating Unit by Class of Assets and by Reportable Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets $ 3,101 $ 494  
Total impairment of non-current assets 2,583 494 $ 250
Total impairment of non-current assets 52   $ 14
Net impairment of non-current assets 3,101 494  
Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 2,583 494  
Goodwill and other intangible assets [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 52    
Equity- accounted investment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 466    
Total impairment of non-current assets 466    
New South Wales Energy Coal [Member] | Coal [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 1,057    
Total impairment of non-current assets 1,025    
Total impairment of non-current assets 32    
Cerrejon [Member] | Coal [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 466    
Total impairment of non-current assets 466    
Potash [Member] | G&U [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 1,314    
Total impairment of non-current assets 1,314    
Cerro Colorado [Member] | Copper [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets   409  
Total impairment of non-current assets   409  
Other [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 264 85  
Total impairment of non-current assets 244 $ 85  
Total impairment of non-current assets $ 20