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Goodwill and other intangible assets - Amortization of Softwares Recognized in Income Statement (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Cost of sales € 13,205 € 12,628 [1] € 11,882 [1]
Research and development expenses 7,394 6,507 [1] 6,501 [1]
Selling and general expenses 9,183 8,933 [1] 8,739 [1]
Other operating expenses 4,382 3,443 [1] 2,523 [1]
Net income excluding the exchanged/held-for-exchange Animal Health business 64 338 [1] 401 [1]
Amortization expense 1,749 1,911 [1] 1,804 [1]
Amortization of computer software and other rights of an industrial or operational nature      
Disclosure of detailed information about intangible assets [line items]      
Cost of sales 16 14 [2] 9
Research and development expenses 1 3 [2] 1
Selling and general expenses 87 100 [2] 82
Other operating expenses 1 2 [2] 4
Net income excluding the exchanged/held-for-exchange Animal Health business 1 1 [2] 1
Amortization expense € 106 € 120 [2] € 97
[1] Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation
[2] (a)Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation