Shareholders' Equity - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of pension settlement	$ 2	$ 5	$ 5	$ 12
Total before tax effect	213	343	999	899
Tax effect on amounts reclassified into earnings	(34)	(72)	(125)	(196)
Net income attributable to Amcor plc	177	269	868	696
Foreign currency translation adjustment	2,994	2,977	9,018	8,609
Reclassification out of AOCI | Amortization of prior service credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of pension settlement	(1)	(1)	(3)	(3)
Reclassification out of AOCI | Amortization of actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of pension settlement	1	1	2	4
Reclassification out of AOCI | Effect of pension settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effect of pension settlement	0	0	0	3
Reclassification out of AOCI | Total net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax effect	0	0	(1)	4
Tax effect on amounts reclassified into earnings	0	0	0	0
Net income attributable to Amcor plc	0	0	(1)	4
Reclassification out of AOCI | (Gains) losses on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax effect	(2)	(3)	2	(14)
Tax effect on amounts reclassified into earnings	0	1	(1)	3
Net income attributable to Amcor plc	(2)	(2)	1	(11)
Reclassification out of AOCI | (Gains) losses on cash flow hedges | Commodity contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment	(4)	(3)	(2)	(15)
Reclassification out of AOCI | (Gains) losses on cash flow hedges | Forward exchange contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment	1	(1)	2	(1)
Reclassification out of AOCI | (Gains) losses on cash flow hedges | Treasury locks
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment	1	1	2	2
Reclassification out of AOCI | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax effect	0	0	74	0
Tax effect on amounts reclassified into earnings	0	0	0	0
Net income attributable to Amcor plc	0	0	74	0
Foreign currency translation adjustment	$ 0	$ 0	$ 74	$ 0