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Note 32 - Capital Base and Capital Management - Leverage Ratio (Details) - EUR (€)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Capital Base And Capital Management      
Tier 1 eligible capital resources capital base € 49,597,000,000 € 49,701,000,000 € 45,947,000,000
Exposure (thousand of euros) € 741,095,000,000 € 731,087,000,000 € 705,299,000,000
Leverage Ratio 6.69% 6.80% 6.51%