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Investments Accounted for Using the Equity Method - Summary of Movements of Investments Accounted for using the Equity Method (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [Line Items]      
Profit/(loss) from equity accounted investments, related impairments and expenses $ 147 $ 272 $ (2,104)
Funding provided during the period (142)    
Joint ventures [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Profit/(loss) from equity accounted investments, related impairments and expenses (509)    
Funding provided during the period (80)    
Joint ventures [member] | Samarco dam failure [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Share of loss (80)    
Funding provided during the period (80)    
Other movements (429)    
Change in estimate (560)    
Exchange translation $ 131