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Related party transactions - Amounts incurred by entity for provision of key management personnel services (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
Share-based payments 7 14 25
Post-employment benefits 2 2 2
Key management personnel remuneration $ 27 $ 38 $ 59