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Revenue and Expenses - Depreciation and Amortization (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Property, plant and equipment (Note 8) € 4,102 € 4,055 € 4,133
Intangible assets (Note 6) 2,462 2,583 2,599
Rights of use (Note 9) 2,235 2,159 2,064
Total € 8,799 € 8,797 € 8,796