v3.26.1
Shareholders' Equity - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other non-operating income/(expenses), net $ (7) $ (12) $ 3
Cost of sales 18,816 12,175 10,928
Income/(loss) before income taxes 1,282 650 907
Tax effect on amounts reclassified into earnings (181) (135) (163)
Net income attributable to Amcor plc 1,106 511 730
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other non-operating income/(expenses), net (2) (3) (4)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other non-operating income/(expenses), net 3 7 3
Reclassification out of Accumulated Other Comprehensive Income | Effect of pension settlement/curtailment      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other non-operating income/(expenses), net 13 12 2
Reclassification out of Accumulated Other Comprehensive Income | Accumulated defined benefit plans adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Income/(loss) before income taxes 14 16 1
Tax effect on amounts reclassified into earnings 0 0 0
Net income attributable to Amcor plc 14 16 1
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Income/(loss) before income taxes (3) 1 4
Tax effect on amounts reclassified into earnings 1 1 0
Net income attributable to Amcor plc (2) 2 4
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Commodity contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Cost of sales (6) (1) 2
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Forward exchange contracts      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Cost of sales 0 (1) (1)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Treasury locks      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Cost of sales 3 3 3
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on foreign currency translation      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Cost of sales 18 8 0
Income/(loss) before income taxes 18 8 0
Tax effect on amounts reclassified into earnings 0 0 0
Net income attributable to Amcor plc 18 8 0
Reclassification out of Accumulated Other Comprehensive Income | Net Investment Hedge      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Gains on net investment hedges: (6) 0 0
Tax effect on amounts reclassified into earnings 0 0 0
Net income attributable to Amcor plc (6) 0 0
Reclassification out of Accumulated Other Comprehensive Income | Net Investment Hedge | Cross currency swaps      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Gains on net investment hedges: $ (6) $ 0 $ 0