v3.25.4
Post-employment benefits - Classification net position (Detail) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Post-employment benefits [Line Items]    
Net position € (519) € (510)
Fair value of plan assets    
Post-employment benefits [Line Items]    
Net position 0 50
Total present value of DBO    
Post-employment benefits [Line Items]    
Net position (520) (560)
Germany    
Post-employment benefits [Line Items]    
Net position (251) (277)
Germany | Fair value of plan assets    
Post-employment benefits [Line Items]    
Net position 0 0
Germany | Total present value of DBO    
Post-employment benefits [Line Items]    
Net position (251) (277)
United States    
Post-employment benefits [Line Items]    
Net position (117) (82)
United States | Fair value of plan assets    
Post-employment benefits [Line Items]    
Net position 0 49
United States | Total present value of DBO    
Post-employment benefits [Line Items]    
Net position (117) (131)
Other countries    
Post-employment benefits [Line Items]    
Net position (151) (151)
Other countries | Fair value of plan assets    
Post-employment benefits [Line Items]    
Net position 0 1
Other countries | Total present value of DBO    
Post-employment benefits [Line Items]    
Net position € (152) € (152)