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Note 3 Contribution to consolidated group total assets entities by main activities (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contribution to Consolidated Group total assets [Line Items]      
Assets € 662,885 € 733,797 € 695,471
Banking and other financial services [Member]      
Contribution to Consolidated Group total assets [Line Items]      
Assets 631,683 703,304 664,100
Insurance and pension fund managing companies [Member]      
Contribution to Consolidated Group total assets [Line Items]      
Assets 29,657 28,667 29,300
Other non-financial services [Member]      
Contribution to Consolidated Group total assets [Line Items]      
Assets € 1,545 € 1,826 € 2,071