XML 453 R42.htm IDEA: XBRL DOCUMENT
v3.22.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Disclosure of summary of significant accounting policies [abstract] |
Schedule of Main Exchange Rates Used for Preparation of Financial Statements | The following table summarizes the main exchange rates used for the preparation of the Consolidated Financial Statements:
|  |  |  | Average rates |  | Closing rates |  |  |  |
Foreign exchange rate for 1 Euro |  |  |  | Year ended December 31, |  | At December 31, |  |  |  |
|  |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |  |  |  |
U.S. Dollars |  | USD |  | 1.1821 |  | 1.1405 |  | 1.1193 |  | 1.1326 |  | 1.2271 |  | 1.1234 |  |  |  |
Swiss Francs |  | CHF |  | 1.0808 |  | 1.0704 |  | 1.1121 |  | 1.0331 |  | 1.0802 |  | 1.0854 |  |  |  |
Czech Koruna |  | CZK |  | 25.6366 |  | 26.4337 |  | 25.6698 |  | 24.8580 |  | 26.2420 |  | 25.4080 |  |  |  |

X
- Definition Disclosure of summary of significant accounting policies [abstract] + References No definition available. + Details
Name: | cstm_DisclosureOfSummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | cstm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for the effect of changes in foreign exchange rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2021-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS21_g51-57_TI -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration