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Shareholders' Equity - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Effect of pension settlement/curtailment $ 1 $ (1)
Tax effect on amounts reclassified into earnings (49) (43)
Net income attributable to Amcor plc 262 191
Foreign currency translation adjustment 4,621 2,694
Reclassification out of AOCI | Amortization of prior service credit    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Effect of pension settlement/curtailment (1) (1)
Reclassification out of AOCI | Amortization of actuarial loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Effect of pension settlement/curtailment 2 1
Reclassification out of AOCI | Effect of pension settlement/curtailment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Effect of pension settlement/curtailment 0 0
Reclassification out of AOCI | Total net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax effect 1 0
Tax effect on amounts reclassified into earnings 0 0
Net income attributable to Amcor plc 1 0
Reclassification out of AOCI | (Gains)/Losses on cash flow hedges:    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax effect 2 0
Tax effect on amounts reclassified into earnings 0 0
Net income attributable to Amcor plc 2 0
Reclassification out of AOCI | (Gains)/Losses on cash flow hedges: | Commodity contracts    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustment 1 (1)
Reclassification out of AOCI | (Gains)/Losses on cash flow hedges: | Forward exchange contracts    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation adjustment 0 0
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