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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
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

X

- 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

X

- Definition

Number of financial counterparties.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- 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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Namespace Prefix:	ifrs-full_
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X

- 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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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: