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Other operating expenses - Summary of other operating expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Expenses by nature [abstract]      
Regulatory costs € 1,042 € 1,250 € 1,265
Audit and non-audit services 36 31 34
IT related expenses 948 818 781
Advertising and public relations 369 331 305
External advisory fees 299 310 301
Office expenses 289 273 281
Travel and accommodation expenses 125 91 52
Contributions and subscriptions 122 109 112
Postal charges 36 31 38
Depreciation of property and equipment 461 485 573
Amortisation of intangible assets 213 226 261
(Reversals of) impairments of property and equipment 32 19 26
(Reversals of) impairments of intangible assets 6 60 95
Addition to / (unused amounts reversed of) provision for reorganisations 173 170 214
Addition to / (unused amounts reversed of) other provisions 70 117 254
Other 617 726 658
Other operating expense € 4,839 € 5,047 € 5,251