Inventories - Summary of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Classes of current inventories [abstract]
Inventory write-downs	$ 37	$ 16	$ 18
Inventory write-downs, made in previous periods that were reversed	$ 13	$ 21	$ 2

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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