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Earnings Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income attributable to Amcor plc $ 152 $ 232
Distributed and undistributed earnings attributable to shares to be repurchased (1) (2)
Net income available to ordinary shareholders of Amcor plc—basic and diluted $ 151 $ 230
Weighted-average ordinary shares outstanding 1,447 1,485
Weighted-average ordinary shares to be repurchased by Amcor plc (8) (11)
Effect of dilutive shares 0 12
Weighted-average ordinary shares outstanding for EPS—diluted 1,439 1,486
Basic earnings per share (USD per share) $ 0.105 $ 0.156
Diluted earnings per share (USD per share) $ 0.105 $ 0.155
Excluding forward contracts to purchase own shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted-average ordinary shares outstanding for EPS—basic 1,439 1,474