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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 13,426 $ 15,613 $ 15,871  
Net finance costs (911) (1,064) (1,245)  
Depreciation and amortisation 6,112 5,829 6,288  
Interest income 351 446 322  
Interest expense 1,262 1,510 1,567  
Income tax benefit/(expense) (4,774) (5,529) (7,007)  
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 15 246    
Current financial liabilities (excluding trade and other payables and provisions) 6,023 5,510    
Share of loss       $ (655)
Impairment       $ (525)
Additional share of loss (3,341)      
Loss from funding provided to Samarco (2,929)      
Net finance costs (412)      
Depreciation and amortisation 84 85 73  
Interest income 16 22 31  
Interest expense 588 342 385  
Income tax benefit/(expense) (256) 52 $ (154)  
Samarco Mineracao S.A. [member] | Working Capital Funding [Member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Additional cumulative impairment losses (405)      
Individually immaterial, associates [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Unrecognised share of profits (losses) 12 15    
Cumulative losses $ 193 $ 181