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REVENUE - Disaggregation of Revenue by Product Line (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of products and services [line items]      
Total Revenue by product line € 6,152 € 4,883 € 5,907
Packaging rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 2,673 1,960 2,172
Automotive rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 854 663 816
Specialty and other thin-rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 161 102 151
Aerospace rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 389 560 863
Transportation, industry, defense and other rolled products      
Disclosure of products and services [line items]      
Total Revenue by product line 713 442 557
Automotive extruded products      
Disclosure of products and services [line items]      
Total Revenue by product line 735 665 797
Other extruded products      
Disclosure of products and services [line items]      
Total Revenue by product line € 627 € 491 € 551