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REVENUE - Disaggregation of Revenue by Product Line (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of products and services [line items]      
Total Revenue by product line € 8,120 € 6,152 € 4,883
Packaging rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 3,326 2,673 1,960
Automotive rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 1,154 854 663
Specialty and other thin-rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 175 161 102
Aerospace rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 728 389 560
Transportation, industry, defense and other rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 916 713 442
Automotive extruded products      
Disclosure of products and services [line items]      
Total Revenue by product line 949 735 665
Other extruded products      
Disclosure of products and services [line items]      
Total Revenue by product line € 872 € 627 € 491