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Nota 25 - Post-employment and other employee benefit commitments. Investments in listed markets (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Cash And Cash Equivalents [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | € 38,000,000 | € 56,000,000 | € 26,000,000
Debt Instruments [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | 2,707,000,000 | 2,668,000,000 | 2,080,000,000
Investment Funds Member |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | 1,000,000 | 2,000,000 | 2,000,000
Total Member |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | 2,747,000,000 | 2,727,000,000 | 2,109,000,000
Bank Account In Bbva [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | 4,000,000 | 4,000,000 | 3,000,000
Debt Securities Issued By Bbva [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets Line Items |  |  |
Assets Of Benefit Plan | € 0 | € 0 | € 0

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