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Capital and financial risk management - Net financial instruments - Derivative financial liabilities (Details) - Derivative financial instruments - EUR (€)
€ in Millions
Mar. 31, 2021
Mar. 31, 2020
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements    
Gross amount € (4,010) € (4,767)
Amount set off 0  
Amounts presented in balance sheet (4,010) (4,767)
Right of set off with derivative counterparties 1,989 3,556
Cash collateral € 2,194 € 1,115