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Goodwill and other intangible assets - Schedule of Movements in Goodwill (Details) - Goodwill - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in goodwill [line items]      
Beginning balance € 49,892 € 48,056 € 44,364
Acquisitions during the period 475 609 2,179
Other movements during the period (90) (258) (89)
Currency translation differences (873) 1,485 1,602
Ending balance € 49,404 € 49,892 € 48,056