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Basis of preparation - Additional Information (Details)
€ in Millions
12 Months Ended
Mar. 31, 2023
EUR (€)
Apr. 01, 2023
EUR (€)
Mar. 31, 2023
₺ / €
Mar. 31, 2023
Br / €
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
EUR (€)
Basis of Preparation                
Cash and cash equivalents € 11,628       € 7,371 € 5,790   € 13,288
Equity € 64,483       57,073 € 57,768 € 62,625  
Exchange rate     20.85 58.59        
Adoption of IAS 29                
Basis of Preparation                
Equity         565      
Adoption of IAS 29 | Reclassification for adoption of new IFRS | Minimum | Forecast                
Basis of Preparation                
Insurance and reinsurance liabilities   € 400            
Adoption of IAS 29 | Reclassification for adoption of new IFRS | Maximum | Forecast                
Basis of Preparation                
Insurance and reinsurance liabilities   € 650            
Opening balance after adjustment, cumulative effect at date of initial application [member]                
Basis of Preparation                
Equity         € 57,638      
Turkey                
Basis of Preparation                
Price index movements 50.5              
Non-controlling interests € 37              
Ethiopia                
Basis of Preparation                
Price index movements 31.3