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Dividend per ordinary share - Schedule of dividends to shareholders of the parent (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
Apr. 25, 2024
Oct. 31, 2024
Aug. 31, 2024
May 31, 2024
Aug. 31, 2023
May 31, 2023
Aug. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dividend per ordinary share [abstract]                    
Dividend per ordinary share paid (in EUR per share)     € 0.350 € 0.756 € 0.350 € 0.389 € 0.170      
Dividends paid     € 1,129 € 2,497 € 1,260 € 1,408 € 636      
Dividend declared, per ordinary share (in EUR per share)               € 0.710    
Dividend declared               € 2,145    
Dividends per ordinary share (in EUR per share) € 1.106 € 0.161           € 1.060 € 1.106 € 0.559
Dividends               € 3,274 € 3,757 € 2,044