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Note 19 Tax assets and liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Tax assets and liabilities [Line Items]      
Current tax assets [1] € 1,978 € 932 € 1,199
Deferred tax assets 14,494 14,917 15,327
Tax assets 16,472 15,850 16,526
Current tax liabilities [1] 1,415 644 545
Deferred tax liabilities 1,326 1,769 1,809
Tax liabilities 2,742 2,413 2,355
Pensions [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 422 416 439
Financial instruments [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,302 1,408 1,292
Deferred tax liabilities 568 1,124 908
Loss allowances [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,834 1,676 1,683
Other [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 1,184 1,101 1,069
Deferred tax liabilities 758 645 901
Secured tax assets [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets 8,689 9,304 9,361
Tax losses [Member]      
Tax assets and liabilities [Line Items]      
Deferred tax assets € 1,063 € 1,012 € 1,483
[1] (1) The increase in current tax assets relates mainly to a higher tax receivable by the tax group in Spain for the refund of the 2022 corporate income tax as a result of the instalment payments made in the year. On the other hand, the increase in current tax liabilities mainly corresponds to a higher tax payable in both Mexico and Turkey in relation to the estimated corporate income tax for the year 2022.