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Rights of Use - Expenses Related to Leases Included in Operating Results and Income from Subleasing Right-of-Use Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Rights of Use [Abstract]    
Short-term leases included in operating results as supplies € 64 € 73
Variable lease payments not included in the measurement of lease liabilities 18 14
Total expenses as supplies 82 87
Short-term leases included in external services 54 45
Leases of low-value assets included in external services 7 7
Variable lease payments not included in the measurement of lease liabilities 36 16
Total expenses as external services (Note 26) 97 68
Total lease expenses € 179 € 155