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Personnel costs - Summary of Personal Costs (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee Benefits [Abstract]      
Salaries € 7,145 € 6,625 € 6,508
Social security charges (including defined-contribution pension plans) 2,098 1,929 1,874
Stock options and other share-based payment expense 245 244 274
Defined-benefit plans 236 273 162
Other employee benefits 267 269 261
Total € 9,991 € 9,340 € 9,079