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Debt - Short-term debt (Detail) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt [Abstract]      
Short-term bank borrowings € 122 € 89  
Current portion of non-current borrowings 532 842  
Current borrowings and current portion of non-current borrowings € 654 € 931 € 506