v3.26.1
Capital and financial risk management - Net financial instruments - Derivative financial assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements    
Gross amount € 1,163 € 2,291
Amounts presented in balance sheet 1,163 2,291
Cash collateral (430) (1,347)
Net amount 733 944
Collateral pledged as initial margin that does not offset against existing mark to market balances 609 613
Derivative financial liabilities    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements    
Derivative financial liabilities, Gross amount (1,812) (1,906)
Derivative financial liabilities, Amounts presented in balance sheet (1,812) (1,906)
Derivative financial liabilities, Right of set off with derivative counterparties 921 1,146
Derivative financial liabilities, Cash collateral 1,169 1,010
Derivative financial liabilities, Net amount 278 250
Derivative financial assets    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements    
Derivative financial assets, Gross amount 2,975 4,197
Derivative financial assets, Amounts presented in balance sheet 2,975 4,197
Derivative financial assets, Right of set off with derivative counterparties (921) (1,146)
Derivative financial assets, Cash collateral (1,599) (2,357)
Derivative financial assets, Net amount € 455 € 694