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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
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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- Definition

The amount of gains and losses arising from financial assets and liabilities and exchange differences.

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