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Equity - Hyperinflation additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of equity [Line Items]        
Total equity € 55,628 € 57,004 € 52,802 € 52,640
Currency translation reserve (2,527) (2,395) (3,483)  
Retained earnings 40,299 41,538 35,462  
Shareholders' equity (parent)        
Disclosure of equity [Line Items]        
Total equity 54,684 56,500 € 52,066 € 51,619
Opening balance after adjustment, cumulative effect at date of initial application | IAS 29        
Disclosure of equity [Line Items]        
Total equity 54 100    
Currency translation reserve 284 1,011    
Retained earnings 0 (563)    
Other reserves 3 (17)    
Net result (before non-controlling interests) € (234) (331)    
Opening balance after adjustment, cumulative effect at date of initial application | IAS 29 | Shareholders' equity (parent)        
Disclosure of equity [Line Items]        
Total equity   € 64