v3.26.1
Non-current provisions and other non-current liabilities - Disclosure of Remeasurement of Net Defined Benefit Liability Asset (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Actuarial assumption of discount rates | Minimum    
Disclosure of net defined benefit liability (asset) [Line Items]    
Increase in actuarial assumption 0.05% 0.00%
Actuarial assumption of discount rates | Maximum    
Disclosure of net defined benefit liability (asset) [Line Items]    
Increase in actuarial assumption 0.50% 0.30%
United Kingdom | Actuarial assumption of expected rates of inflation    
Disclosure of net defined benefit liability (asset) [Line Items]    
Increase in actuarial assumption 0.15%  
Decrease in actuarial assumption   (0.30%)
Pensions and other post-employment benefits | Opella Business    
Disclosure of net defined benefit liability (asset) [Line Items]    
Actuarial gains/(losses) on benefit obligations   € (4)
Plan assets | Pensions and other post-employment benefits    
Disclosure of net defined benefit liability (asset) [Line Items]    
Actuarial gains/(losses) on plan assets € 71 (45)
Present value of defined benefit obligation | Pensions and other post-employment benefits    
Disclosure of net defined benefit liability (asset) [Line Items]    
Actuarial gains/(losses) on benefit obligations € 86 € 152