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Other operating expenses - Summary of other operating expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Expenses by nature [abstract]      
Regulatory costs € 882 € 1,042 € 1,250
Audit and non-audit services 43 36 31
IT related expenses 1,048 948 818
Advertising and public relations 441 369 331
External advisory fees 321 299 310
Office expenses 277 289 273
Travel and accommodation expenses 126 125 91
Contributions and subscriptions 133 122 109
Postal charges 39 36 31
Depreciation of property and equipment 457 461 485
Amortisation of intangible assets 216 213 226
(Reversals of) impairments of property and equipment 18 32 19
(Reversals of) impairments of intangible assets 13 6 60
Addition to / (unused amounts reversed of) provision for reorganisations 142 173 170
Addition to / (unused amounts reversed of) other provisions 76 70 117
Other 704 617 726
Other operating expense € 4,937 € 4,839 € 5,047