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Cash and cash equivalents (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cash and cash equivalents    
Cash and cash equivalents € 10,193 € 10,155
Financial assets, classified as cash equivalents 6,462 6,804
Restricted cash 205 € 97
US Dollars    
Cash and cash equivalents    
Cash and cash equivalents 7,328  
Financial assets, classified as cash equivalents 5,275  
Euro    
Cash and cash equivalents    
Cash and cash equivalents 1,945  
Financial assets, classified as cash equivalents € 598