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Inventories - Schedule of Inventories (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of inventories [line items]      
Raw materials € 1,550 € 1,474 € 1,278
Work in process 5,316 4,985 5,025
Finished goods 2,800 2,501 2,412
Total 9,666 8,960 8,715
Gross value      
Disclosure of inventories [line items]      
Raw materials 1,676 1,613 1,344
Work in process 5,869 5,663 5,579
Finished goods 3,045 2,748 2,696
Total 10,590 10,024 9,619
Allowances      
Disclosure of inventories [line items]      
Raw materials 126 139 66
Work in process 553 678 554
Finished goods 245 247 284
Total € 924 € 1,064 € 904