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PROVISIONS - Legal Claims and Other Costs (Details) - Legal claims and other costs - EUR (€) € in Millions	Jun. 30, 2023	Dec. 31, 2022
Disclosure of other provisions [line items]
Litigation	€ 15	€ 15
Disease claims	9	10
Total provisions for legal claims and other costs	€ 24	€ 25

X

- Definition

Provision for disease claims.

+ References

No definition available.

+ Details

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Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Provision for litigation.

+ References

No definition available.

+ Details

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Namespace Prefix:	cstm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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X

- Definition

The amount of provision for legal proceedings. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Section Example 10 A court case
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-URIDate 2022-03-24

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-IssueDate 2022-03-24
-Paragraph 87
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-URIDate 2022-03-24

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: