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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - OLD Additional Information (Details) - EUR (€) € in Millions	Jun. 30, 2024	Dec. 31, 2023
Summary of significant accounting policies [line items]
Lease liabilities	€ 152	€ 154

X

- Definition

Line items representing the summary of significant accounting policies.

+ References

No definition available.

+ Details

Name:	cstm_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix:	cstm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 2023-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant