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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets $ 515 $ 2,973  
Total impairment of non-current assets, Property, plant and equipment 515 2,583  
Total impairment of non-current assets, Goodwill and other intangibles   52  
Net impairment of non-current assets 515 3,101  
Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets 515 2,583  
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, Goodwill and other intangibles   33  
Net 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, Equity-accounted investment   466  
Net impairment of non-current assets   466  
Continuing operation [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets 515 2,973  
Continuing operation [member] | Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets, Property, plant and equipment 515 2,474 $ 482
Net impairment of non-current assets 515 2,474  
Continuing operation [member] | 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, Goodwill and other intangibles   33  
Net impairment of non-current assets   33  
Continuing operation [member] | Equity- accounted investment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets   466  
Discontinued operations [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets   128  
Discontinued operations [member] | Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets   109  
Discontinued operations [member] | Goodwill and other intangible assets [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Net impairment of non-current assets   19  
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, Property, plant and equipment   1,025  
Total impairment of non-current assets, Goodwill and other intangibles   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, Equity-accounted investment   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, Property, plant and equipment   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 455    
Cerro Colorado [Member] | Copper [Member] | Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets, Property, plant and equipment 455    
Other [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 60 136  
Total impairment of non-current assets, Property, plant and equipment   135  
Total impairment of non-current assets, Goodwill and other intangibles   $ 1  
Other [Member] | Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets, Property, plant and equipment $ 60