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Equity - Schedule of share premium (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity [abstract]      
Opening balance € 17,116 € 17,105 € 17,089
Issue of shares 0 12 16
Closing balance € 17,116 € 17,116 € 17,105