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Note 19 - Tax assets and liabilities- Effective tax rate (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Consolidated Tax Group [Member] |  |  |
Effective Tax Rate Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | € 259,000,000 | € (718,000,000) | € 1,482,000,000
Other Spanish Entities [Member] |  |  |
Effective Tax Rate Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | 7,000,000 | 7,000,000 | 33,000,000
Foreign Entities [Member] |  |  |
Effective Tax Rate Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | 4,982,000,000 | 7,757,000,000 | 6,050,000,000
Total Member |  |  |
Effective Tax Rate Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | 5,248,000,000 | 7,046,000,000 | 7,565,000,000
Income Tax and Other Taxes [Member] |  |  |
Effective Tax Rate Line Items |  |  |
Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity | € 1,459,000,000 | € 1,943,000,000 | € 2,042,000,000
Effective Tax Rate [Member] |  |  |
Effective Tax Rate Line Items |  |  |
Percentage Effective Tax Rate | 27.80% | 27.60% | 27.00%

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- Definition The amount of Current And Deferred Tax Relating To Items Charged Or Credited Directly To Equity + References No definition available. + Details
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