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Lease Liabilities - Maturity Schedule of Lease Liabilities (Details)
€ in Millions
Dec. 31, 2023
EUR (€)
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities € 9,943
2024  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 2,354
2025  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 1,876
2026  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 1,455
2027  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 1,190
2028  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 1,008
Subsequent years  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities 2,060
Non-current total  
Disclosure of maturity analysis of operating lease payments [line items]  
Lease liabilities € 7,589