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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 6 Months Ended 12 Months Ended
Apr. 25, 2024
May 31, 2024
Aug. 31, 2023
May 31, 2023
Aug. 31, 2022
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Dividend per ordinary share [abstract]                
Dividend per ordinary share paid (in EUR per share)   € 0.756 € 0.35 € 0.389 € 0.17   € 0.756  
Dividends paid   € 2,497 € 1,260 € 1,408 € 634      
Dividends per ordinary share (in EUR per share) € 1.106         € 0.35 € 1.106 € 0.559
Dividends           € 1,149 € 3,757 € 2,042
Proposed cash dividend, per ordinary share (in EUR per share)           € 0.35    
Proposed cash dividend           € 1,149