Operating costs - Other external charges (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Analysis of income and expense [abstract]
Research and development expenditure	$ 74	$ 69	$ 63
Maintenance and repairs expense	$ 179	$ 171	$ 171

The amount of expenses incurred for the day-to-day servicing of assets, which may include the cost of labour, consumables or small parts.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_RepairsAndMaintenanceExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration