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FINANCIAL RISK MANAGEMENT - Exposure to Financial Counterparties by Rating Type (Details) € in Thousands | Dec. 31, 2023 EUR (€) counterparty | Dec. 31, 2022 EUR (€) counterparty
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Number of financial counterparties | counterparty | 13 | 9
Exposure | € 213,000 | € 166,000
Credit exposure threshold amount | € 250 | € 250
Rated Aa or better |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Number of financial counterparties | counterparty | 2 | 2
Exposure | € 54,000 | € 51,000
Rated A |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Number of financial counterparties | counterparty | 10 | 6
Exposure | € 159,000 | € 112,000
Rated Baa |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Number of financial counterparties | counterparty | 1 | 1
Exposure | € 0 | € 3,000

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- Definition Credit exposure threshold amount. + References No definition available. + Details
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Namespace Prefix: | cstm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of financial counterparties. + References No definition available. + Details
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Balance Type: | na
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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
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |