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Earnings per share (Details 2) - shares
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Earnings per share      
Weighted average number of shares outstanding 602,000,000 609,000,000 544,000,000
Treasury shares (9,000,000) (20,000,000) 0
Warrants 92,000,000 90,000,000 0
Weighted average number of common shares diluted 685,000,000 679,000,000 544,000,000