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Related party transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other related party transactions
Other related party transactions			$ 0
AGSA
Related party borrowings and receivables
Transaction and other costs reimbursed to (from) AGSA		$ 1	2	$ (12)
AGSA | Selling, general and administrative expenses
Related party borrowings and receivables
Corporate and business unit services	$ 10	$ 9	$ 19	$ 19

X

- Definition

The aggregate net amount of other related party transactions.

+ References

No definition available.

+ Details

Name:	ambp_OtherRelatedPartyTransactions
Namespace Prefix:	ambp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

No definition.

+ References

No definition available.

+ Details

Name:	ambp_OtherRelatedPartyTransactionsAbstract
Namespace Prefix:	ambp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of transaction and other costs reimbursed during the period.

+ References

No definition available.

+ Details

Name:	ambp_TransactionAndOtherCostsReimbursed
Namespace Prefix:	ambp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_RelatedPartyTransactionsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of services received in related party transactions. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 21
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_21_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_ServicesReceivedRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=ifrs-full_SellingGeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: