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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, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets $ 3,890 $ 75  
Total impairment of non-current assets, Property, plant and equipment 3,833 73  
Total impairment of non-current assets, Goodwill and other intangibles 57 2  
Net impairment of non-current assets 3,890 75 $ 515
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 3,833 73 $ 515
Net impairment of non-current assets 3,833 73  
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 57 2  
Net impairment of non-current assets 57 2  
Western Australia Nickel [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 3,800    
Total impairment of non-current assets, Property, plant and equipment 3,744    
Total impairment of non-current assets, Goodwill and other intangibles 56    
Western Australia Nickel [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 3,744    
Western Australia Nickel [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 56    
Other [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 90 75  
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 89 73  
Other [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 $ 1 $ 2