v3.25.2
Subsidiaries - Summary of Significant Subsidiaries (Parenthetical) (Detail) - BHP Iron Ore (Jimblebar) Pty Ltd [member]
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of significant subsidiaries [line items]    
Effective Group interest 92.50% 92.50%
Group's interest 85.00% 85.00%