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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 15,246 $ 13,426 $ 15,613  
Investment 1,742 2,585 2,569  
Net finance costs (1,305) (911) (1,064)  
Depreciation and amortisation 6,824 6,112 5,829  
Interest income 73 351 446  
Interest expense 1,378 1,262 1,510  
Income tax (expense)/benefit (11,150) (4,774) (5,529)  
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 134 15    
Current financial liabilities (excluding trade and other payables and provisions) 6,567 6,023    
Investment       $ 0
Share of loss       (655)
Impairment       $ (525)
Additional share of loss (4,442)      
Loss from funding provided to Samarco (3,945)      
Net finance costs (497)      
Depreciation and amortisation 154 84 85  
Interest income 1 16 22  
Interest expense 492 588 342  
Income tax (expense)/benefit (303) (256) $ 52  
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) 40 12    
Cumulative losses 233 193    
Investment $ 380 $ 356