v3.26.1
Intangible assets - Additional information (Details) - EUR (€)
€ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 24, 2026
Apr. 30, 2026
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items]              
Increase (decrease) in goodwill     € 113        
Intangible assets     1,740 € 1,740   € 1,510 € 1,334
Other changes       69 € 2    
Goodwill              
Disclosure of detailed information about intangible assets [line items]              
Intangible assets     588 588   477 476
Other changes       43    
Other              
Disclosure of detailed information about intangible assets [line items]              
Intangible assets     € 28 28   € 3 € 3
Other changes       € 26 € 1    
Goldman Sachs TFI              
Disclosure of detailed information about intangible assets [line items]              
Percentage of voting equity interests acquired 55.00% 55.00%          
Remeasurement pre-existing interest € 25            
Goldman Sachs TFI | Other              
Disclosure of detailed information about intangible assets [line items]              
Other changes   € 26