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Income from operations - Employee benefit expenses (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income from operations [Line Items]      
Wages and salaries € 5,635 € 5,594 € 5,014
Share-based compensation costs 97 104 115
Post-employment benefits costs 402 439 396
Social security contributions 567 590 529
Voluntary social security contributions 202 225 192
Employee benefits expense € 6,903 € 6,952 € 6,246