Financial instruments and risk management - Schedule of available undrawn committed bank facilities (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Jun. 30, 2025 |
|---|---|---|
| Disclosure of information about undrawn borrowing facilities [line items] | ||
| Undrawn committed bank facilities | $ 4,563 | $ 3,500 |
| Expiring within one year | ||
| Disclosure of information about undrawn borrowing facilities [line items] | ||
| Undrawn committed bank facilities | 1,063 | 1,040 |
| Expiring after one year | ||
| Disclosure of information about undrawn borrowing facilities [line items] | ||
| Undrawn committed bank facilities | $ 3,500 | $ 2,460 |