v3.25.1
Capital and financial risk management - Liquidity risk - Borrowings (Details)
€ in Millions, $ in Billions
12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2025
EUR (€)
Mar. 31, 2024
EUR (€)
Borrowings      
Principal amount   € 22,628.0 € 24,783.0
Minimum      
Borrowings      
Long-term borrowings maturity (in years) 1 year    
Maximum      
Borrowings      
Long-term borrowings maturity (in years) 61 years    
Revolving credit facility      
Borrowings      
Undrawn revolving credit facilities   7,800.0  
Revolving credit facility | Maximum | US Dollar      
Borrowings      
Principal amount $ 4.0 3,700.0  
Revolving credit facility | Maximum | Euro      
Borrowings      
Principal amount     4,100.0
Committed bank facilities      
Borrowings      
Undrawn revolving credit facilities   € 8.0 € 8.0