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Equity - Hyperinflation additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]        
Total equity € 53,698 € 55,628 € 57,004 € 52,802
Currency translation reserve (1,986) (2,527) (2,395)  
Retained earnings 36,243 40,299 41,538  
Opening balance after adjustment, cumulative effect at date of initial application | IAS 29        
Disclosure of equity [Line Items]        
Total equity 50 54 100  
Currency translation reserve 202 284 1,011  
Retained earnings 0 0 (563)  
Other reserves 4 3 (17)  
Net result (before non-controlling interests) € (156) € (234) € (331)