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Segment Information - Schedule of Acquisition of Intangible Assets, Property, Plant and Equipment and Investments Accounted for Using the Equity Method by Segment (Details)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
EUR (€)
segment
Jun. 30, 2023
EUR (€)
Dec. 31, 2023
EUR (€)
Disclosure of operating segments [Line Items]      
Investments accounted for using the equity method € 315   € 424
Number of operating segments | segment 2    
Total      
Disclosure of operating segments [Line Items]      
Investments accounted for using the equity method € 243 [1] € 241 [2] 262 [3]
Acquisitions of property, plant and equipment 950 782 1,719
Acquisitions of other intangible assets 936 148 1,305
Dupixent      
Disclosure of operating segments [Line Items]      
Investments accounted for using the equity method 229 [1] 231 [2] 234 [3]
Acquisitions of property, plant and equipment 882 751 1,619
Acquisitions of other intangible assets 922 132 1,287
Opella      
Disclosure of operating segments [Line Items]      
Investments accounted for using the equity method [2]   10  
Acquisitions of property, plant and equipment   31  
Acquisitions of other intangible assets   € 16  
Opella      
Disclosure of operating segments [Line Items]      
Investments accounted for using the equity method 14 [1]   28 [3]
Acquisitions of property, plant and equipment 68   100
Acquisitions of other intangible assets € 14   € 18
[1]
(a) Carrying amount at the end of the reporting period.
[2]
(a) Carrying amount at the end of the reporting period.
[3]
(a) Carrying amount at the end of the reporting period.