v3.25.4
Goodwill and intangible assets - Narrative (Details)
€ in Millions
 1 Months Ended 12 Months Ended
May 31, 2025
EUR (€)
Dec. 31, 2025
business_group
Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items]      
Number of business groups | business_group   4  
Indefinite-life intangible assets      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill | € € 42    
Top of range      
Disclosure of detailed information about intangible assets [line items]      
Amortisation period of finite-life intangible assets   ten  
Discount rate   18.20% 16.50%
Top of range | Total Significant CGUs      
Disclosure of detailed information about intangible assets [line items]      
Discount rate   12.30% 11.40%
Bottom of range      
Disclosure of detailed information about intangible assets [line items]      
Discount rate   9.60% 9.00%
Bottom of range | Total Significant CGUs      
Disclosure of detailed information about intangible assets [line items]      
Discount rate   9.70% 9.00%