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Inventories - Schedule of Inventories (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of inventories [line items] |  |  |
Raw materials | € 1,453 | € 1,550 | € 1,474
Work in process | 5,296 | 5,316 | 4,985
Finished goods | 2,682 | 2,800 | 2,501
Total | 9,431 | 9,666 | 8,960
Gross value |  |  |
Disclosure of inventories [line items] |  |  |
Raw materials | 1,588 | 1,676 | 1,613
Work in process | 5,777 | 5,869 | 5,663
Finished goods | 2,899 | 3,045 | 2,748
Total | 10,264 | 10,590 | 10,024
Allowances |  |  |
Disclosure of inventories [line items] |  |  |
Raw materials | 135 | 126 | 139
Work in process | 481 | 553 | 678
Finished goods | 217 | 245 | 247
Total | € 833 | € 924 | € 1,064

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