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Other operating expenses - Summary of other operating expenses (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Expenses by nature [abstract]    
Regulatory costs € 446 € 616
Audit and non-audit services 19 19
IT related expenses 497 429
Advertising and public relations 199 175
External advisory fees 135 142
Office expenses 143 150
Travel and accommodation expenses 60 59
Contributions and subscriptions 72 63
Postal charges 18 20
Depreciation of property and equipment 224 225
Amortisation of intangible assets 107 103
(Reversals of) impairments of property and equipment 6 5
(Reversals of) impairments of intangible assets 3 0
Addition to / (unused amounts reversed of) provision for reorganisations 57 46
Addition to / (unused amounts reversed of) other provisions 34 19
Other 372 304
Other operating expense € 2,393 € 2,376