Equity - Schedule of fair value of each share award used the Monte Carlo and Black Scholes pricing model and weighted average assumptions (Details) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Jun. 30, 2026
USD ($)
£ / shares
shares
|
Jun. 30, 2026
USD ($)
$ / shares
shares
|
Jun. 30, 2025
USD ($)
£ / shares
shares
|
Jun. 30, 2025
USD ($)
$ / shares
shares
|
Jun. 30, 2024
USD ($)
£ / shares
shares
|
Jun. 30, 2024
USD ($)
$ / shares
shares
|
|
| Disclosure of reserves within equity [abstract] | ||||||
| Risk free interest rate | 3.80% | 3.80% | 3.90% | 3.90% | 4.70% | 4.70% |
| Expected life of the awards | 34 months | 34 months | 33 months | 33 months | 33 months | 33 months |
| Dividend yield | 4.40% | 4.40% | 3.40% | 3.40% | 2.60% | 2.60% |
| Weighted average share price (in GBP per share) | £ / shares | £ 18.57 | £ 24.26 | £ 31.18 | |||
| Weighted average fair value of awards granted in the year (in USD per share) | $ / shares | $ 12.59 | $ 18.14 | $ 17.57 | |||
| Number of awards granted in the year (in shares) | shares | 3.6 | 3.6 | 3.4 | 3.4 | 2.1 | 2.1 |
| Fair value of all awards granted in the year (in million of dollars) | $ | £ 46 | $ 46 | £ 61 | $ 61 | £ 36 | $ 36 |