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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Expense related to short-term leases, low value asset leases and variable lease still recognized as operating expenses | € 18 | € 15 | € 12

X
- Definition Expense Relating To Short-Term Leases, Leases Of Low-Value Assets And Variable Lease Payments For Which Recognition Exemption Has Been Used + References No definition available. + Details
Name: | cstm_ExpenseRelatingToShortTermLeasesLeasesOfLowValueAssetsAndVariableLeasePaymentsForWhichRecognitionExemptionHasBeenUsed
Namespace Prefix: | cstm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration