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Financial assets and liabilities - Movement in net debt (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Financial assets and liabilities |  |
Net (increase)/decrease in cash, cash equivalents and restricted cash per consolidated statement of cash flows | $ (167) | $ 112
Increase in net borrowings and derivative financial instruments | 160 | 163
(Decrease)/increase in net debt | (7) | 275
Net debt at January 1, | 3,312 | 3,037
Net debt at December 31, | $ 3,305 | $ 3,312

X
- Definition The amount of increase (decrease) in total borrowings. + References No definition available. + Details
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Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of increase (decrease) in net debt. + References No definition available. + Details
Name: | ambp_IncreaseDecreaseInNetDebt
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in cash, cash equivalents and restricted cash after the effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies. + References No definition available. + Details
Name: | ambp_NetIncreaseDecreaseInCashCashEquivalentsAndRestrictedCash
Namespace Prefix: | ambp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The amount of net debt of the entity. + 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
Name: | ifrs-full_NetDebt
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant