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

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- Definition Line items representing the summary of significant accounting policies. + References No definition available. + Details
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Namespace Prefix: | cstm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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