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Earnings per share (Details) - shares
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Profit / (loss) per share attributable to equity holders of the parent: (ii)      
Weighted average outstanding shares 809,000,000 588,000,000 575,000,000
Adjustments for calculation of diluted earnings per share Treasury shares 2,000,000 0 2,000,000
Adjustments for calculation of diluted earnings per share warrants 80 0 0
Weighted - average diluted common shares 891,000,000 588,000,000 577,000,000