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Related party transactions - Directors remuneration (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits $ 12 $ 13 $ 13
Annual incentive plan 4 7 17
Non-Executive Directors' fees 2 2 2
Post-employment benefits 2 2 2
Directors      
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits 4 3 4
Annual incentive plan 1 2 5
Non-Executive Directors' fees 2 2 2
Share option exercises 0 0 6
Shares vesting 18 5 3
Post-employment benefits 0 1 0
Directors remuneration $ 25 $ 13 $ 20