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Commitments and contingent liabilities - Summary of Potential Future Lease Commitments and Other Commitments Fall Due (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Lease And Other Commitments [Line Items]    
Leases € 291 € 319
Other Commitments 4,370 4,057
Within 1 year    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 64 64
Other Commitments 1,510 1,806
Later than 1 year but not later than 5 years    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 79 91
Other Commitments 2,595 2,020
Later than 5 years    
Disclosure Of Lease And Other Commitments [Line Items]    
Leases 148 164
Other Commitments € 265 € 231