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Note 29 - Treasury Shares Treasury Stock - Treasury Shares (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Treasury Share Reconciliation Line Items        
Treasury shares Balance at beginning € 96 € 48 € 309  
Number of treasury shares at the beginning 13,339,582 7,230,787 38,917,665  
Changes in treasury shares abstract        
Purchase of treasury shares € 1,683 € 1,674 € 2,004  
Sale or cancellation of treasury shares (1,505) (1,622) (2,263)  
Treasury Shares Derivatives On Shares 0 (4) (1)  
Treasury Shares Other Changes 23 0 0  
Shares In Entity Held By Entity Or By ItsSubsidiaries Or Associates millions of euros 0 0 22  
Treasury Shares Held By Corporacion General Financiera S.A 296 96 26  
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 € (24) € 1 € (30)  
Purchases of treasury shares number of shares 279,903,844 238,065,297 379,850,939  
Sales and other changes treasury shares number of shares (245,985,735) (231,956,502) (411,537,817)  
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 0 0 2,789,894  
Treasury Shares Held By Corporacion General Financiera S A number of shares 47,257,691 13,339,582 4,440,893  
Held by other subsidiaries number of shares 0 0 0  
Average purchase price in Euros number of shares 6.11 7.03 5.27  
Treasury Shares Average Selling Price In Euros number of shares 6.25 6.99 5.5  
Treasury shares Balance at the end € 296 € 96 € 48  
Number of treasury shares 13,339,582 7,230,787 38,917,665 47,257,691