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Note 13 - Quantitative Information about Fair Value (Level 3) (Detail: Text Values) - Valuation technique unobservable parameters (Level 3) [Member] - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets [Member]    
Non-derivative other financial instruments held at fair value, Included in other financial assets [Abstract]    
Other trading assets € 104 € 196
Other financial assets mandatory at fair value through profit or loss 2,400 2,400
Other financial assets at FV through OCI 117 38
Liabilities [Member]    
Included in other financial liabilities [Abstract]    
Securities sold under repurchase agreements designated at fair value € 154 141
Other financial liabilities designated at fair value   € 45