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Related-party transactions - Related-party transactions (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related-party transactions [Abstract]      
Revenue from sale of goods, related party transactions € 106 € 111 € 116
Purchases of goods, related party transactions 42 46 41
Amounts receivable, related party transactions 18 55 40
Amounts payable, related party transactions € 2 € 2 € 2