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Note 19 - Tax assets and liabilities - Secured tax assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2016
[1]
Pensions [Member]      
Secured Tax Assets Line Items      
Secured Tax Assets deferred taxes € 1,874 € 1,897 € 1,901
Impairment Losses [Member]      
Secured Tax Assets Line Items      
Secured Tax Assets deferred taxes 7,489 7,536 7,530
Total [Member]      
Secured Tax Assets Line Items      
Secured Tax Assets deferred taxes € 9,363 € 9,433 € 9,431
[1]

(*) In 2017 and 2016 guaranteed deferred tax assets also existed in Portugal but in 2018 they lost the guarantee.