v3.26.1
Goodwill and other intangible assets - Schedule of Movements in Other Intangible Assets (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period € 26,261  
Amortization expense (1,087) € (777)
Intangible assets other than goodwill at end of period 26,359  
Gross value    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 83,585  
Changes in scope of consolidation 1,150  
Acquisitions and other increases 531  
Disposals and other decreases (579)  
Currency translation differences 1,568  
Transfers (411)  
Intangible assets other than goodwill at end of period 85,844  
Accumulated amortization and impairment    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period (57,324)  
Amortization expense 1,164  
Impairment losses, net of reversals 1,048  
Disposals and other decreases 577  
Currency translation differences (930)  
Transfers 404  
Intangible assets other than goodwill at end of period (59,485)  
Acquired R&D    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 8,731  
Intangible assets other than goodwill at end of period 8,026  
Acquired R&D | Gross value    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 14,951  
Changes in scope of consolidation 0  
Acquisitions and other increases 321  
Disposals and other decreases (534)  
Currency translation differences 324  
Transfers (245)  
Intangible assets other than goodwill at end of period 14,817  
Acquired R&D | Accumulated amortization and impairment    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period (6,220)  
Amortization expense 0  
Impairment losses, net of reversals 970  
Disposals and other decreases 534  
Currency translation differences (135)  
Transfers 0  
Intangible assets other than goodwill at end of period (6,791)  
Products, trademarks and other rights    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 17,122  
Intangible assets other than goodwill at end of period 17,911  
Products, trademarks and other rights | Gross value    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 66,746  
Changes in scope of consolidation 1,149  
Acquisitions and other increases 122  
Disposals and other decreases (17)  
Currency translation differences 1,232  
Transfers (162)  
Intangible assets other than goodwill at end of period 69,070  
Products, trademarks and other rights | Accumulated amortization and impairment    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period (49,624)  
Amortization expense 1,106  
Impairment losses, net of reversals 61  
Disposals and other decreases 17  
Currency translation differences (785)  
Transfers 400  
Intangible assets other than goodwill at end of period (51,159)  
Software    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 408  
Intangible assets other than goodwill at end of period 422  
Software | Gross value    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period 1,888  
Changes in scope of consolidation 1  
Acquisitions and other increases 88  
Disposals and other decreases (28)  
Currency translation differences 12  
Transfers (4)  
Intangible assets other than goodwill at end of period 1,957  
Software | Accumulated amortization and impairment    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill at beginning of period (1,480)  
Amortization expense 58  
Impairment losses, net of reversals 17  
Disposals and other decreases 26  
Currency translation differences (10)  
Transfers 4  
Intangible assets other than goodwill at end of period € (1,535)