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Note 14 Derivatives Hedge accounting and fair value changes of the hedged items in portfolio hedge of interest rate risk (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Disclousre of derivative financial assets held for hedging [Line Items]    
Derivative financial assets held for hedging € 1,530,000,000 € 1,991,000,000
Accumulated fair value hedge adjustment on hedged item included in carrying amount, assets 23,000,000 51,000,000
Derivative financial liabilities held for hedging 2,384,000,000 2,318,000,000
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities € 0 € 0