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Note 18 - Intangible assets. Other intangible assets (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Intangible Assets Other Than Goodwill Line Items |  |  |
Other intangible assets | € 1,435,000,000 | € 2,010,000,000 | € 2,134,000,000
Computer Software Acquisiton Expenses [Member] |  |  |
Intangible Assets Other Than Goodwill Line Items |  |  |
Other intangible assets | 1,202,000,000 | 1,598,000,000 | 1,605,000,000
Intangible Assets With Indefinite Useful Life Member |  |  |
Intangible Assets Other Than Goodwill Line Items |  |  |
Other intangible assets | 12,000,000 | 11,000,000 | 11,000,000
Intangible Assets With definite Useful Life [Member] |  |  |
Intangible Assets Other Than Goodwill Line Items |  |  |
Other intangible assets | € 221,000,000 | € 401,000,000 | € 518,000,000

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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