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Property, plant and equipment - Property, plant and equipment (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, plant and equipment [Line Items]      
Property, plant and equipment € 2,483 € 2,638  
Owned [member]      
Property, plant and equipment [Line Items]      
Property, plant and equipment 1,565 1,718  
Right-of-use assets [member]      
Property, plant and equipment [Line Items]      
Property, plant and equipment € 919 € 919 € 1,058