v3.26.1
Operating costs - Other external charges (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Analysis of income and expense [abstract]      
Research and development expenditure $ 71 $ 74 $ 69
Maintenance and repairs expense $ 181 $ 179 $ 171