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TRADE RECEIVABLES AND OTHER - Contract Assets (Details) - EUR (€) € in Millions	Jun. 30, 2022	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]
Contact assets, Non-current	€ 16	€ 19
Unbilled tooling costs
Disclosure of disaggregation of revenue from contracts with customers [line items]
Contact assets, Non-current	€ 4	€ 6

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 non-current contract assets. [Refer: Contract assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_105&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Details

Name:	ifrs-full_CategoriesOfAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomersAxis=cstm_UnbilledToolingCostsMember
Namespace Prefix:
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