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Significant Events - Summary of Provision for Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of other provisions [line items]    
Current $ 2,810 $ 2,175
Non-current 11,185 8,928
Samarco dam failure [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 1,914 1,285
Movement in provisions 137 629
Utilised (369) (328)
Change in estimate - Samarco dam failure provision 916 579
Change in estimate - Samarco Germano dam decommissioning 37 263
Amortisation of discounting impacting net finance costs 93 108
Exchange translation (540) 7
Current 896 440
Non-current 1,155 1,474
At the end of the financial year $ 2,051 $ 1,914