XML 517 R106.htm IDEA: XBRL DOCUMENT
v3.22.0.1

DEFERRED INCOME TAXES - Components of Unrecognized Deferred Tax Assets (Details) - EUR (€) € in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | € (191) | € (224)
Tax losses |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (85) | (81)
Long-term assets |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (65) | (91)
Pensions |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (7) | (16)
Other |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (34) | (36)
Deductible temporary differences |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (106) | (143)
Between 1- 5 years | Tax losses |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (3) | (3)
Expiring after 5 years and limited | Tax losses |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | (55) | (55)
Unlimited | Tax losses |  |
Significant components of deferred tax assets and liabilities [line items] |  |
Related tax impact | € (27) | € (23)

X
- Definition Significant components of deferred tax assets and liabilities line items. + References No definition available. + Details
Name: | cstm_SignificantComponentsOfDeferredTaxAssetsAndLiabilitiesLineItems
Namespace Prefix: | cstm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=ifrs-full_UnusedTaxLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=cstm_LongTermAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=cstm_PensionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=ifrs-full_OtherTemporaryDifferencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=ifrs-full_TemporaryDifferenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=cstm_LaterThanFiveYearsAndLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=cstm_UnlimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |