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Note 25 - Post-employment and other employee benefit commitments. Plan Assets Breakdown (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash And Cash Equivalents [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan € 38,000,000 € 56,000,000 € 26,000,000
Debt Instruments [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 2,707,000,000 2,668,000,000 2,080,000,000
Property Amount [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 0 0 0
Investment Funds Member      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 1,000,000 2,000,000 2,000,000
Insurance Contract [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 140,000,000 142,000,000 132,000,000
Other Assets [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 0 0 0
Total Member      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 2,887,000,000 2,869,000,000 2,241,000,000
Bank Account In Bbva [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan 4,000,000 4,000,000 3,000,000
Debt Securities Issued By Bbva [Member]      
Assets Of Benefit Plan Line Items      
Assets Of Benefit Plan € 0 € 0 € 0