v3.26.1
Capital and financial risk management - Liquidity risk - Borrowings (Details)
€ in Millions, $ in Billions
12 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2026
EUR (€)
Mar. 31, 2025
EUR (€)
Borrowings      
Principal amount   € 18,786 € 22,628
Minimum      
Borrowings      
Long-term borrowings maturity (in years) 1 year    
Maximum      
Borrowings      
Long-term borrowings maturity (in years) 60 years    
Revolving credit facility      
Borrowings      
Undrawn revolving credit facilities   7,600  
Revolving credit facility | Maximum | United States of America, Dollars      
Borrowings      
Principal amount $ 4.0 3,500  
Revolving credit facility | Maximum | Euro      
Borrowings      
Principal amount     4,100
Committed bank facilities      
Borrowings      
Undrawn revolving credit facilities   € 7,600 € 8,000