v3.25.2
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, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets $ 261 $ 3,890  
Net impairment of non-current assets 171 3,890  
Reversal of impairment (90)    
Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 196 3,833  
Net impairment of non-current assets 106 3,833 $ 73
Reversal of impairment (90)    
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 2 57  
Net impairment of non-current assets 2 57 $ 2
Equity- accounted investment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 63    
Net impairment of non-current assets 63    
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  
Reversal of impairment (90)    
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   3,744  
Reversal of impairment (90)    
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   56  
Other [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets 261 90  
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 196 89  
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 2 $ 1  
Other [Member] | Equity- accounted investment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Total impairment of non-current assets $ 63