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REVENUE - Disaggregation of Revenue by Product Line (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | € 7,239 | € 8,120 | € 6,152
Packaging rolled products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 2,596 | 3,326 | 2,673
Automotive rolled products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 1,156 | 1,154 | 854
Specialty and other thin-rolled products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 127 | 175 | 161
Aerospace rolled products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 1,022 | 728 | 389
Transportation, industry, defense and other rolled products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 692 | 916 | 713
Automotive extruded products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 934 | 949 | 735
Other extruded products |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | 693 | 872 | 627
Other metal sales |  |  |
Disclosure of products and services [line items] |  |  |
Total Revenue by product line | € 19 | € 0 | € 0

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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