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Revenue and Expenses - Earnings Per Share (Details) - € / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Basic earnings per share (in euros per share) € (0.06) € (0.20) € 0.31
Diluted earnings per share (in euros per share) € (0.06) € (0.20) € 0.31