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Note 41 - Gains (losses) on financial assets and liabilities (net) and Exchange Differences - Breakdown by nature of the financial instrument (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | € 1,187,000,000 | € 705,000,000 | € 1,136,000,000
Debt Securities [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | 848,000,000 | 945,000,000 | 354,000,000
Equity instruments [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | (28,000,000) | 1,336,000,000 | (253,000,000)
Derivatives [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | 277,000,000 | (1,133,000,000) | 858,000,000
Loans and advances [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | 128,000,000 | 78,000,000 | (190,000,000)
Customer Deposits [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | (79,000,000) | (26,000,000) | 239,000,000
Other [Member] |  |  |
Gains Or Losses In Financial Assets And Liabilities Breakdown By Financial Instrument LineI tems |  |  |
Equity Instruments, gains (losses) on financial instruments | € 42,000,000 | € (497,000,000) | € 127,000,000

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