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Commitments, contingencies and legal proceedings - Contingent commitments (Details)
€ in Millions, $ in Millions
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Jan. 31, 2022
USD ($)
Contingent liability for guarantees | Commercial guarantees      
Guarantees and other contingent commitments      
Guarantees issued by financial institutions € 1,477 € 1,238  
Corporate guarantees 325 504  
Contingent liability for guarantees | Non-commercial guarantees      
Guarantees and other contingent commitments      
Guarantees issued by financial institutions 615 538  
Corporate guarantees 35 32  
Financing commitments | Customer finance commitments      
Guarantees and other contingent commitments      
Capital finance commitments 5 26  
Financing commitments | Venture fund commitments      
Guarantees and other contingent commitments      
Venture fund commitments € 381 € 433  
Financing commitments | NGP Capital's Fund V      
Guarantees and other contingent commitments      
Venture fund commitments | $     $ 400