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Related party transactions - Transactions between associates and joint ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Income statement items      
Sales $ 14 $ 13 $ 15
Purchases 73 16 42
Balance sheet items      
Group payables 2 3 2
Group receivables 2 2 2
Loans receivable 355 254 212
Cash flow items      
Loans and equity contributions, net $ 134 $ 112 $ 86