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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 (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets      
HEDGING DERIVATIVES, ASSETS € 2,892 € 2,485 € 2,833
FAIR VALUE CHANGES OF THE HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RATE RISK, ASSETS (21) (25) 17
Liabilities Abstract      
HEDGING DERIVATIVES, LIABILITIES 2,680 2,880 2,347
FAIR VALUE CHANGES OF THE HEDGED ITEMS IN PORTFOLIO HEDGES OF INTEREST RATE RISK, LIABILITIES € 0 € (7) € 0