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Revenues and other income - Associated with liabilities and performance obligations (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues and other income      
Revenues associated with contract liabilities at the beginning of the period € 642 € 157 € 658
Revenues associated with performance obligations totally or partially satisfied in previous years € 1,087 € 1 € 30