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Revenue and Expenses - Revenues (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Revenues from rendering of services € 35,480 € 34,832 € 34,479
Lease revenues 79 71 76
Sale of goods 5,756 5,749 5,438
Total € 41,315 € 40,652 € 39,993