v3.25.4
Post-employment benefits - Defined benefit obligations (Detail) - Present value of defined benefit obligation - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Post-employment benefits [Line Items]    
Net defined benefit liability (asset) at beginning of period € 1,659 € 1,605
Service cost 31 29
Interest cost 52 65
Employee contributions 4 4
Actuarial (gains) / losses    
- demographic assumptions (1) 0
- financial assumptions (49) 20
- experience adjustment 1 9
(Negative) past service cost 13 (7)
Settlements (331) 1
Benefits paid from plan (103) (63)
Benefits paid directly by employer (36) (36)
Translation differences and other (60) 32
Net defined benefit liability (asset) at end of period € 1,180 € 1,659