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Earnings per share (Details) - shares
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Profit / (loss) per share attributable to equity holders of the parent: (ii)      
Weighted average outstanding shares 748,000,000 756,000,000 550,000,000
Adjustments for calculation of diluted earnings per share Treasury shares (11,000,000) (23,000,000)  
Adjustments for calculation of diluted earnings per share warrants 8 8 0
Weighted - average diluted common shares 745,000,000 741,000,000 550,000,000