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Equity - Schedule of fair value of each share award used the Monte Carlo pricing model and weighted average assumptions (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2024
USD ($)
£ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
£ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
£ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Disclosure of reserves within equity [abstract]            
Risk free interest rate 4.70% 4.70% 3.10% 3.10% 0.40% 0.40%
Expected life of the awards 33 months 33 months 35 months 35 months 40 months 40 months
Dividend yield 2.60% 2.60% 2.00% 2.00% 2.10% 2.10%
Weighted average share price (in GBP per share) | £ / shares £ 31.18   £ 37.58   £ 35.45  
Weighted average fair value of awards granted in the year (in USD per share) | $ / shares   $ 17.57   $ 23.18   $ 37.54
Number of awards granted in the year (in shares) | shares 2.1 2.1 1.7 1.7 2.1 2.1
Fair value of all awards granted in the year (in million of dollars) | $ £ 36 $ 36 £ 40 $ 40 £ 79 $ 79