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Note 15 - Hedging derivatives and fair value changes of the hedged items in portfolio hedge of interest rate risk - Derivatives Hedging Accounting (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
HEDGING DERIVATIVES, ASSETS € 1,991,000,000 € 1,729,000,000 € 2,892,000,000
FAIR VALUE CHANGES OF THE HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RATE RISK, ASSETS 51,000,000 28,000,000 (21,000,000)
Liabilities Abstract      
HEDGING DERIVATIVES, LIABILITIES 2,318,000,000 2,233,000,000 2,680,000,000
FAIR VALUE CHANGES OF THE HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RATE RISK, LIABILITIES € 0 € 0 € 0