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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Benefit Payments Expected to be Paid Either by Pension Funds or Directly to Beneficiaries (Details) € in Millions | 12 Months Ended
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Dec. 31, 2023 EUR (€)
Disclosure of employee benefits [Abstract] |
2024 | € 57
2025 | 56
2026 | 55
2027 | 56
2028 | 60
2029 to 2033 | € 300

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- Definition Disclosure of employee benefits + References No definition available. + Details
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- Definition Estimated future benefit payments Five Fiscal Years Thereafter + References No definition available. + Details
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Namespace Prefix: | cstm_
Data Type: | xbrli:monetaryItemType
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- Definition Estimated future benefit payments next twelve months + References No definition available. + Details
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Namespace Prefix: | cstm_
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- Definition Estimated future benefit payments Year Five + References No definition available. + Details
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- Definition Estimated future benefit payments Year Four + References No definition available. + Details
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Balance Type: | debit
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- Definition Estimated future benefit payments Year Three + References No definition available. + Details
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- Definition Estimated future benefit payments Year Two + References No definition available. + Details
Name: | cstm_EstimatedFutureBenefitPaymentsYearTwo
Namespace Prefix: | cstm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration