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Personnel expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense € (1,760) € (1,599) € (1,446)
Increase decrease in employee benefits 162 153  
Wages and salaries [Member]      
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense (1,468) (1,350) (1,111)
Increase decrease in employee benefits 118 239  
Social security contributions [Member]      
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense (375) (179) (158)
Increase decrease in employee benefits 196 21  
Pension plan contributions [Member]      
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense (18) (15) (13)
Increase decrease in employee benefits 3 3  
Share based payments [Member]      
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense (13) (11) (8)
Increase decrease in employee benefits 2 4  
Other welfare expenses [Member]      
Disclosure of detailed information about personnel expenses [Line Items]      
Employee benefits expense (114) (43) € (156)
Increase decrease in employee benefits € (157) € (113)