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Property, plant and equipment - Property, plant and equipment breakdown (Detail) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property, plant and equipment [Line Items]      
Property, plant and equipment € 2,217 € 2,452 € 2,483
Property, plant and equipment      
Property, plant and equipment [Line Items]      
Property, plant and equipment 1,465 1,565 1,565
Right-of-use assets      
Property, plant and equipment [Line Items]      
Property, plant and equipment € 752 € 886 € 919