v3.25.1
Basis of preparation - Additional Information (Details)
€ in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
Mar. 31, 2024
EUR (€)
Mar. 31, 2023
EUR (€)
Mar. 31, 2025
₺ / EUR
Mar. 31, 2025
Br / EUR
Mar. 31, 2024
₺ / EUR
Mar. 31, 2024
Br / EUR
Apr. 01, 2023
₺ / EUR
Apr. 01, 2023
Br / EUR
Disclosure of Basis Of Preparation [Line Items]                  
Exchange rate       41 141.92 34.94 61.43 20.85 58.59
Current borrowings € 7,047 € 7,728 € 12,708            
Non-current borrowings € 46,096 € 49,259 € 53,682            
Turkey, New Lira                  
Disclosure of Basis Of Preparation [Line Items]                  
Price index movements 38.1 68.5 50.5            
Ethiopia, Birr                  
Disclosure of Basis Of Preparation [Line Items]                  
Price index movements 13.6 26.2 31.3            
Bonds                  
Disclosure of Basis Of Preparation [Line Items]                  
Current borrowings € 1,529 € 361              
Non-current borrowings 34,873 40,382              
Forecast | Bonds | Increase (decrease) due to changes in accounting policy required by IFRSs                  
Disclosure of Basis Of Preparation [Line Items]                  
Non-current borrowings   931 € 2,013            
Future effect of adoption of amendments to IAS 1 on April first 2024 | Forecast | Bonds | Increase (decrease) due to changes in accounting policy required by IFRSs                  
Disclosure of Basis Of Preparation [Line Items]                  
Current borrowings € 931 € 2,013