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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents $ 15,613 $ 15,871 $ 14,153  
Investment 2,569 2,473 2,448  
Net finance costs (1,064) (1,245) (1,417)  
Depreciation and amortisation 5,829 6,288 6,184  
Interest income 446 322 143  
Interest expense 1,510 1,567 1,560  
Income tax benefit/(expense) (5,529) (7,007) (4,443)  
Samarco Mineracao S.A. [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Cash and cash equivalents 246 23    
Current financial liabilities (excluding trade and other payables and provisions) 5,510 5,066    
Investment      
Share of loss       (655)
Impairment       $ (525)
Additional share of loss (3,145)      
Loss from funding provided to Samarco (310)      
Net finance costs (319)      
Depreciation and amortisation 85 73 88  
Interest income 22 31 57  
Interest expense 342 385 473  
Income tax benefit/(expense) 52 (154) $ (851)  
Samarco Mineracao S.A. [member] | Samarco dam failure [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Other movements (2,835)      
Individually immaterial, associates [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Unrecognised share of profits (losses) 15 (56)    
Cumulative losses 181 196    
Investment $ 371 $ 277