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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of exceptional items [line items]      
Other income $ 777 $ 393 $ 247
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (28,775) (28,022) (27,527)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (494) (264) (333)
Net finance costs (911) (1,064) (1,245)
Total (1,546) (1,060) (650)
Samarco dam failure [member]      
Disclosure of exceptional items [line items]      
Other income 489 50  
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (64) (57) (57)
Loss from equity accounted investments, related impairments and expenses:      
Samarco impairment expense (95) (96) (80)
Samarco Germano dam decommissioning 46 (263)  
Samarco dam failure provision (459) (586) (429)
Net finance costs (93) (108) (84)
Total $ (176) $ (1,060) $ (650)