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Other liabilities - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other liabilities [abstract]      
Payments of lease liabilities, classified as financing activities € 291 € 296 € 301
Share buyback programme, liability € 538 € 297