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Impairment of Intangible Assets (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of impairment loss and reversal of impairment loss [abstract]      
Impairment loss on other intangible assets € (371) € 15 € 896