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Note 7 - Risk Management - Impairment Losses Reconciliations II (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes In Allowance Account For Credit Losses Of Financial Assets Abstract |  |  |  |  |
Recovery of written-off assets | € (339,000,000) | € (919,000,000) | [1] | € (589,000,000) | [1]
[1] | (*) In 2020, the amount includes the negative impact of the update of the macroeconomic scenario following the COVID-19 pandemic (see Notes 1.5 and 7.2).

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- Definition The gain on the recovery of loans and advances previously written off. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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