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Provisions - Individual Suspension Plan (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Provisions for employee benefits € 5,954 € 4,978
Individual Suspension Plan    
Disclosure of defined benefit plans [line items]    
Provisions for employee benefits € 3,648 € 4,150
Discount rate 3.08%  
Average duration of plans 3 years 2 months 4 days