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Financial assets and liabilities - Financing activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disclosure of detailed information about borrowings [line items] |  |  |  |
Lease obligations |  | $ 370,000,000 |  | $ 374,000,000
New lease liabilities incurred during the year |  | 47,000,000 |  |
Lease liability Repayment |  | 51,000,000 |  |
Proceeds from borrowings | $ 1,000,000 |  | $ 214,000,000 |
Global Asset Based Loan Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds from borrowings |  | 0 |  | 0
Notional amount |  | 333,000,000 |  | $ 272,000,000
Available Borrowing Base |  | 333,000,000 |  |
Global Asset Based Loan Facility When sufficient Working Capital is available [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 355,000,000 |  |

X
- Definition The available borrowing base. + References No definition available. + Details
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Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities related to new leases entered into by the entity during the period. + References No definition available. + Details
Name: | ambp_LeaseLiabilitiesIncurred
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of lease liability repaid during the year. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | na
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- Definition The cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |