v3.25.1
Other investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Other investments      
Non-current other investments € 3,153 € 1,006 € 1,093
Short term investments 7,424 5,092 € 7,017
Equity securities      
Other investments      
Non-current other investments 1,279 65  
Equity securities | Zegona shares [Member] | Level 3      
Other investments      
Financial assets at fair value 937 0  
Bonds And Debt Securities [Member]      
Other investments      
Non-current other investments 1,874 941  
Short-term investments      
Other investments      
Short term investments 5,280 3,225  
Debt Securities Bonds And Debt Securities [Member]      
Other investments      
Short term investments 2,139 1,201  
Debt Securities Bonds And Debt Securities [Member] | Japanese      
Other investments      
Short term investments 573 306  
Debt Securities Bonds And Debt Securities [Member] | Dutch      
Other investments      
Short term investments 0 308  
Debt Securities Bonds And Debt Securities [Member] | GERMANY      
Other investments      
Short term investments 498 0  
Debt Securities Bonds And Debt Securities [Member] | FRANCE      
Other investments      
Short term investments 624 587  
Debt Securities Bonds And Debt Securities [Member] | BELGIUM      
Other investments      
Short term investments 444 0  
Debt Securities Managed Investment Funds [Member]      
Other investments      
Short term investments € 3,141 2,024  
Liquid days 90 days    
Collateral assets      
Other investments      
Short term investments € 1,010 741  
Other investments      
Other investments      
Short term investments 1,134 1,126  
Other investments | Level 1 | Financial assets at fair value      
Other investments      
Short term investments 365 459  
Equity securities and managed investment funds | Level 1 | Financial assets at fair value      
Other investments      
Other investments 306 27  
Equity securities and managed investment funds | Level 3 | Financial assets at fair value      
Other investments      
Other investments 937 0  
Non Current Investments In Sovereign Securities [Member] | Level 1 | Financial assets at fair value      
Other investments      
Financial assets at fair value 909 0  
Non Current Investments In Sovereign Securities [Member] | Level 1 | Financial assets at amortised cost      
Other investments      
Financial assets at fair value 913 0  
Non Current Investments In Sovereign Securities [Member] | Level 2 | Financial assets at fair value      
Other investments      
Financial assets at fair value 788 810  
Non Current Investments In Sovereign Securities [Member] | Level 2 | Financial assets at amortised cost      
Other investments      
Financial assets at fair value 864 830  
Non Current German Bond Securities [Member]      
Other investments      
Financial assets at fair value 609 0  
Non Current Dutch Bond Securities [Member]      
Other investments      
Financial assets at fair value 204 0  
Non Current European Union government securities [Member]      
Other investments      
Financial assets at fair value 100 0  
Debt securities [member] | VodafoneZiggo Group Holding B.V.      
Other investments      
Non-current other investments € 864 € 830