v3.26.1
Other investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Other investments    
Non-current other investments € 2,087 € 3,153
Short term investments 6,770 7,424
Equity securities    
Other investments    
Non-current other investments 1,084 1,279
Equity securities | Financial assets at fair value through other comprehensive income, category [member]    
Other investments    
Financial assets at fair value 1,044 306
Equity securities | Zegona shares [Member] | Level 3    
Other investments    
Financial assets at fair value   937
Bonds And Debt Securities [Member]    
Other investments    
Non-current other investments 1,003 1,874
Short-term investments    
Other investments    
Short term investments 3,431 5,280
Debt Securities Bonds And Debt Securities [Member]    
Other investments    
Short term investments 217 2,139
Debt Securities Bonds And Debt Securities [Member] | Japanese    
Other investments    
Short term investments 217 573
Debt Securities Bonds And Debt Securities [Member] | GERMANY    
Other investments    
Short term investments 0 498
Debt Securities Bonds And Debt Securities [Member] | FRANCE    
Other investments    
Short term investments 0 624
Debt Securities Bonds And Debt Securities [Member] | BELGIUM    
Other investments    
Short term investments 0 444
Debt Securities Managed Investment Funds [Member]    
Other investments    
Short term investments € 3,214 3,141
Liquid days 90 days  
Collateral assets    
Other investments    
Short term investments € 1,169 1,010
Other investments    
Other investments    
Short term investments 2,170 1,134
Other investments | Level 1 | Financial assets at amortised cost    
Other investments    
Short term investments 317 365
Other investments | Level 2 | Financial assets at amortised cost    
Other investments    
Short term investments 769 788
Financial assets at fair value 862 864
Other investments | Level 3 | Financial assets at amortised cost    
Other investments    
Short term investments 13
Equity securities and managed investment funds | Level 1 | Financial assets at fair value    
Other investments    
Other investments 1,044 306
Equity securities and managed investment funds | Level 3 | Financial assets at fair value    
Other investments    
Other investments 0 937
Non Current Investments In Sovereign Securities [Member] | Level 1 | Financial assets at fair value    
Other investments    
Financial assets at fair value 899 909
Non Current Investments In Sovereign Securities [Member] | Level 1 | Financial assets at amortised cost    
Other investments    
Financial assets at fair value 915 913
Non Current German Bond Securities [Member]    
Other investments    
Financial assets at fair value 610 609
Non Current Dutch Bond Securities [Member]    
Other investments    
Financial assets at fair value 203 204
Non Current European Union government securities [Member]    
Other investments    
Financial assets at fair value 102 100
Debt securities [member] | VodafoneZiggo Group Holding B.V.    
Other investments    
Non-current other investments € 862 € 864