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Cash and cash equivalents (Details) - EUR (€)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]        
Cash € 1,461,000,000 € 1,385,000,000 € 1,358,000,000  
Cash equivalents 7,249,000,000 11,351,000,000 8,740,000,000  
Cash and cash equivalents 8,710,000,000 12,736,000,000 10,098,000,000 € 13,915,000,000
Cash equivalents, money market mutual funds 5,349,000,000 9,537,000,000 5,057,000,000  
Cash equivalents, term deposits 1,191,000,000 1,167,000,000 2,768,000,000  
Cash equivalents, commercial paper 0 0 179,000,000  
Cash equivalents, captive insurance and reinsurance companies € 476,000,000 € 439,000,000 € 427,000,000