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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
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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

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