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Note 19 - Tax assets and liabilities - Changes Deferred Taxes Assets And Liabilities (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Deferred Assets [Member] |  |  |
Deferred Tax Assets And Liabilities Line Items |  |  |
Deferred Tax Assets At The Beginning | € 15,318,000,000 | € 15,316,000,000 | € 14,725,000,000
Pensions | (17,000,000) | 51,000,000 | 10,000,000
Financial Instruments | (94,000,000) | (15,000,000) | (52,000,000)
Value Corrections Deferred Assets | 47,000,000 | 261,000,000 | 370,000,000
Other Deferred Assets | 24,000,000 | (247,000,000) | 65,000,000
Seccured Deferred Tax Assets | (2,000,000) | 0 | (70,000,000)
Deferred Tax Losses | 51,000,000 | (48,000,000) | 268,000,000
Deferred Tax At The End | 15,327,000,000 | 15,318,000,000 | 15,316,000,000
Deferred Liabilities [Member] |  |  |
Deferred Tax Assets And Liabilities Line Items |  |  |
Deferred Tax Assets At The Beginning | 1,928,000,000 | 2,046,000,000 | 2,184,000,000
Pensions | 0 | 0 | 0
Financial Instruments | (106,000,000) | (122,000,000) | (291,000,000)
Value Corrections Deferred Assets | 0 | 0 | 0
Other Deferred Assets | (13,000,000) | 4,000,000 | 153,000,000
Seccured Deferred Tax Assets | 0 | 0 | 0
Deferred Tax Losses | 0 | 0 | 0
Deferred Tax At The End | € 1,809,000,000 | € 1,928,000,000 | € 2,046,000,000

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