Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to Amcor plc	$ 177	$ 269	$ 868	$ 696
Distributed and undistributed earnings attributable to shares to be repurchased	(1)	(1)	(6)	(2)
Net income available to ordinary shareholders of Amcor plc—basic and diluted	$ 176	$ 268	$ 862	$ 694
Weighted-average ordinary shares outstanding	1,480	1,506	1,484	1,521
Weighted-average ordinary shares to be repurchased by Amcor plc	(10)	(3)	(11)	(4)
Effect of dilutive shares	6	4	9	4
Weighted-average ordinary shares outstanding for EPS—diluted	1,476	1,507	1,482	1,521
Basic earnings per ordinary share	$ 0.120	$ 0.178	$ 0.585	$ 0.457
Diluted earnings per ordinary share	$ 0.119	$ 0.178	$ 0.581	$ 0.456
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	1,470	1,503	1,473	1,517