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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, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 12,501 $ 12,428 $ 17,236  
Investment 1,662 1,620 1,420  
Net finance costs (1,489) (1,531) (969)  
Depreciation and amortisation 5,295 5,061 5,683  
Interest income 709 529 81  
Interest expense 2,198 2,060 1,050  
Income tax (expense)/benefit (6,447) (7,077) (10,737)  
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 251 138    
Current financial liabilities (excluding trade and other payables and provisions) 7,154    
Investment      
Share of loss       (655)
Impairment       (525)
Additional share of loss (7,891)      
Loss from funding provided to Samarco (6,147)      
Net finance costs (1,744)      
Depreciation and amortisation 165 144 205  
Interest income 43 42 19  
Interest expense 807 1,384 628  
Income tax (expense)/benefit 999 (213) (7)  
Other finance income 1,756 0 $ 0  
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)
Individually immaterial, associates [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Unrecognised share of profits (losses) 41 76    
Cumulative losses 100 141    
Investment $ 164 $ 190