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Note 29 - Treasury Shares Treasury Stock - Treasury Shares (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Treasury Share Reconciliation Line Items        
Treasury shares Balance at beginning € (62,000,000) € (296,000,000)    
Changes in treasury shares abstract        
Treasury shares Balance at the end € (46,000,000) € (62,000,000) € (296,000,000)  
Number Of Treasury Shares [Member]        
Treasury Share Reconciliation Line Items        
Number of treasury shares at the beginning 12,617,189 47,257,691 13,339,582  
Changes in treasury shares abstract        
Treasury Shares Average Purchase Price In Euros € 3.44 € 5.06 € 6.11  
Treasury Shares Average Selling Price In Euros € 3.63 € 5.2 € 6.25  
Purchases of treasury shares number of shares 234,691,887 214,925,699 279,903,844  
Sales and other changes treasury shares number of shares (232,956,244) (249,566,201) (245,985,735)  
Treasury shares derivatives on shares number of shares 0 0 0  
Treasury shares other changes number of shares 0 0 0  
Shares In Entity Held By Entity Or By Its Subsidiaries Or Associate 592,832 0 0  
Treasury Shares Held By Corporacion General Financiera S A number of shares 13,760,000 12,617,189 47,257,691  
Held by other subsidiaries number of shares 0 0 0  
Number of treasury shares 12,617,189 47,257,691 13,339,582 14,352,832
Treasury shares [Member]        
Treasury Share Reconciliation Line Items        
Treasury shares Balance at beginning € 62,000,000 € 296,000,000 € 96,000,000  
Changes in treasury shares abstract        
Purchase of treasury shares 807,000,000 1,088,000,000 1,683,000,000  
Sale or cancellation of treasury shares (830,000,000) (1,298,000,000) (1,505,000,000)  
Treasury Shares Derivatives On Shares 7,000,000 (23,000,000) 23,000,000  
Treasury Shares Other Changes 0 0 0  
Shares In Entity Held By Entity Or By ItsSubsidiaries Or Associates millions of euros 9,000,000 0 0  
Treasury Shares Held By Corporacion General Financiera S.A 37,000,000 62,000,000 296,000,000  
Treasury Shares Held By Other Subsidiaries 0 0 0  
Treasury Shares Average Purchase Price In Euros 0 0 0  
Treasury Shares Average Selling Price In Euros 0 0 0  
Treasury Shares Net Gain Or Losses On Transactions   13,000,000 (24,000,000)  
Treasury shares Balance at the end € 46,000,000 € 62,000,000 € 296,000,000