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Contract assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Contract assets |  |
Balance at beginning of period | $ 259 | $ 239
Transfers from contract assets recognized at beginning of year to receivables. | (254) | (234)
Increases as a result of new contract assets recognized during the year | 256 | 249
Other (including exchange) | (10) | 5
Balance at end of period | $ 251 | $ 259

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- Definition The decrease in contract asset through transfers from contract assets recognized at beginning of year to receivables. + References No definition available. + Details
Name: | ambp_DecreaseThroughTransfersToReceivablesContractAssets
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of increase in contract asset through new contracts recognized. + References No definition available. + Details
Name: | ambp_IncreaseThroughNewContractAssetsRecognized
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of other increase (decrease) in contract assets. + References No definition available. + Details
Name: | ambp_OtherIncreaseDecreaseInContractAssets
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 105 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 116 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_ContractAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration