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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, 2022
Dec. 31, 2021
Rights of Use [Abstract]    
Short-term leases included in operating results as supplies € 22 € 23
Variable lease payments not included in the measurement of lease liabilities 17 18
Total expenses as supplies 39 41
Short-term leases included in external services 52 39
Leases of low-value assets included in external services 8 9
Variable lease payments not included in the measurement of lease liabilities 26 32
Total expenses as external services (Note 26) 86 80
Total lease expenses € 125 € 121