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Goodwill and other intangible assets - Schedule of Allocation of Goodwill (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [line items]      
Goodwill € 43,384 € 49,404 € 49,892