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BORROWINGS - Narrative (Details) € in Millions	Jun. 30, 2022 EUR (€)
Secured inventory facility
Disclosure of detailed information about borrowings [line items]
Borrowing base	€ 100
Money Market facility
Disclosure of detailed information about borrowings [line items]
Borrowing base	€ 50

X

- Definition

Available borrowings under credit facility.

+ References

No definition available.

+ Details

Name:	cstm_BorrowingFacility
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

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=cstm_SecuredInventoryBasedFacilityDueTwoThousandTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=cstm_MoneyMarketFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: