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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, 2024
Jun. 30, 2023
Jun. 30, 2022
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure $ (36,750) $ (31,873) $ (32,371)
(Loss)/profit from equity accounted investments, related impairments and expenses:      
Fair value change on forward exchange derivatives (84) (135) 29
Net finance costs (1,489) (1,531) (969)
Income tax (expense)/benefit (6,447) (7,077) (10,737)
Exceptional items net (5,763) (606) (1,074)
Samarco dam failure [member]      
Expenses excluding net finance costs:      
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure (139) (103) (66)
(Loss)/profit from equity accounted investments, related impairments and expenses:      
Samarco dam failure provision (2,833) (256) (595)
Fair value change on forward exchange derivatives (199) 471 (81)
Net finance costs (506) (452) (290)
Income tax (expense)/benefit (85) 17 (31)
Exceptional items net $ (3,762) $ (323) $ (1,063)