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Earnings Per Share Computations - Schedule of Earnings Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income attributable to Amcor plc $ 262 $ 191
Distributed and undistributed earnings attributable to shares to be repurchased 0 (1)
Net income available to ordinary shareholders of Amcor plc—basic and diluted $ 262 $ 190
Weighted-average ordinary shares outstanding (1) 2,315 1,444
Weighted-average ordinary shares to be repurchased by Amcor plc (1) (4)
Weighted-average ordinary shares outstanding for EPS—basic 10  
Effect of dilutive shares 1 4
Weighted-average ordinary shares outstanding for EPS—diluted 2,315 1,444
Basic earnings per share (USD per share) $ 0.113 $ 0.132
Diluted earnings per share (USD per share) $ 0.113 $ 0.132
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 2,314 1,440