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TRADE PAYABLES AND OTHER - Narrative (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Trade and other payables [abstract]
Revenue recognized related to contract liabilities	€ 11	€ 27
Deferred revenue related to contract liabilities	€ 27	€ 41

X

- Definition

Deferred revenue related to contract liabilities.

+ References

No definition available.

+ Details

Name:	cstm_DeferredRevenueRelatedToContractLiabilities
Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 116
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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