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Note 29 - Capital Base and Capital Management - Leverage Ratio (Details) - EUR (€)
6 Months Ended 12 Months Ended
Jun. 30, 2020
[1]
Dec. 31, 2019
Capital Base And Capital Management    
Tier 1 eligible capital resources capital base € 48,185,000,000 € 49,701,000,000
Exposure (thousand of euros) € 771,590,000,000 € 731,087,000,000
Leverage Ratio 6.24% 6.80%
[1]

(*) Provisional data