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Capital and financial risk management - Net financial instruments - Derivative financial assets (liabilities), net (Details) - EUR (€)
€ in Millions
Mar. 31, 2021
Mar. 31, 2020
Fair value of financial instruments    
Gross amount € (859) € 4,409
Amount set off 0  
Amounts presented in balance sheet (859) 4,409
Cash collateral 1,232 (4,177)
Net amount € 373 € 232