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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, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 12,428 $ 17,236 $ 15,246  
Investment 1,620 1,420 1,742  
Net finance costs (1,531) (969) (1,223)  
Depreciation and amortisation 5,061 5,683 5,084  
Interest income 529 81 67  
Interest expense 2,060 1,050 1,290  
Income tax (expense)/benefit (7,077) (10,737) (10,616)  
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 138 106    
Current financial liabilities (excluding trade and other payables and provisions) 7,154 6,837    
Investment       $ 0
Share of loss       (655)
Impairment       (525)
Additional share of loss (6,034)      
Loss from funding provided to Samarco (4,795)      
Net finance costs (1,239)      
Depreciation and amortisation 144 205 154  
Interest income 42 19 1  
Interest expense 1,384 628 492  
Income tax (expense)/benefit (213) (7) $ (303)  
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) 76 16    
Cumulative losses 141 217    
Investment $ 190 $ 114