Post employment benefits - Schedule of charge before taxation (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Income/(charge) before taxation | $ (93) | $ (51) | $ (42) |
| United Kingdom | |||
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Income/(charge) before taxation | (6) | 2 | 5 |
| Ireland | |||
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Income/(charge) before taxation | (32) | 1 | 3 |
| United States | |||
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Income/(charge) before taxation | (37) | (41) | (35) |
| Other | |||
| Disclosure of net defined benefit liability (asset) [line items] | |||
| Income/(charge) before taxation | $ (18) | $ (13) | $ (15) |