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Staff expenses - Summary of staff expenses (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Staff Expenses [Abstract]      
Salaries € 4,906 € 4,559 € 4,145
Pension costs and other staff-related benefit costs 455 418 390
Social security costs 690 635 584
Share-based compensation arrangements 45 31 26
External employees 720 776 738
Education 49 50 47
Other staff costs 319 256 222
Total staff expenses € 7,184 € 6,725 € 6,152