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Dividend per ordinary share - Additional information (Details) - EUR (€)
€ / shares in Units, € in Millions
 1 Months Ended 12 Months Ended
Aug. 14, 2023
Apr. 24, 2023
Aug. 31, 2023
May 31, 2023
Aug. 31, 2022
May 31, 2022
Oct. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dividend per ordinary share [abstract]                    
Purchased Share buyback programme               € 3,482 € 1,721 € 1,604
Dividends per ordinary share (in eur per share)   € 0.559           € 1.106 € 0.559 € 0.620
Dividend per ordinary share paid (in eur per share) € 0.350   € 0.350 € 0.389 € 0.170 € 0.410 € 0.210      
Other cash distributions               € 0 € 1,171 € 1,054
Other cash distributions, per share                 € 0.31 € 0.27
Withholding tax on dividends paid, ordinary shares               15.00%