v3.26.1
Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 18,532 $ 11,894 $ 12,501  
Investments accounted for using equity method 4,414 4,107 1,662  
Depreciation and amortisation 6,201 5,540 5,295  
Interest income 604 660 709  
Interest expense 2,059 1,771 2,198  
Income tax benefit / (expense) (9,388) (7,210) (6,447)  
Other finance income 31 57    
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 454 419    
Current financial liabilities (excluding trade and other payables and provisions) 0 0    
Non current Liabilities 4,957 4,625    
Investments accounted for using equity method       $ 0
Impairment       525
Depreciation and amortisation 205 165 165  
Interest income 102 54 43  
Interest expense 1,400 1,686 807  
Income tax benefit / (expense) (632) (623) 999  
Other finance income 0 0 $ 1,756  
Samarco Mineracao S.A. [member] | Working Capital Funding [Member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Additional cumulative impairment losses       $ 516
Vicuna [Member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 103 53    
Current financial liabilities (excluding trade and other payables and provisions) 7 1    
Non current Liabilities 13 3    
Depreciation and amortisation 10 1    
Interest income 3 0    
Interest expense 1 0    
Income tax benefit / (expense) 0 0    
Individually immaterial, associates [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Investments accounted for using equity method $ 33 $ 90