Inventories - Summary of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Inventories [Line Items]
Inventory write-downs	$ 243	$ 69	$ 100
Inventory write-downs, made in previous periods that were reversed	18	19	37
Western Australia Nickel (WAN) temporary suspension [member]
Inventories [Line Items]
Inventory write-downs	$ 133	$ 0	$ 0

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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