Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Funded status | $ (243) | $ (304) |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Funded status | (309) | (352) |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Funded status | (11) | (12) |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Funded status | 20 | 0 |
| Location, Statement of Financial Position, Balance [Axis]: amcr:EmployeeBenefitAssets | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Funded status | $ 57 | $ 60 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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