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Note 7 - Risk Management - Loans And Advances At Amortized Cost (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Stage 1 [Member] | Loans And Advances At Amortized Cost At The Beginning [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels € 363,234,000,000 € 352,282,000,000
Stage 1 [Member] | Transfers Of Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (11,935,000,000) (9,021,000,000)
Stage 1 [Member] | Transfers from stage 1 to stage 2 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (15,843,000,000) (13,546,000,000)
Stage 1 [Member] | Transfers from stage 2 to stage 1 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 5,107,000,000 5,656,000,000
Stage 1 [Member] | Transfers to stage 3 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (1,701,000,000) (1,571,000,000)
Stage 1 [Member] | Transfers from stage 3 to stage 1or 2 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 502,000,000 440,000,000
Stage 1 [Member] | Net Production Finnancial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 16,119,000,000 20,296,000,000
Stage 1 [Member] | Writteoffs [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (3,000,000) (152,000,000)
Stage 1 [Member] | Changes In Model    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Stage 1 [Member] | Foreign Exchange Loss [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (21,472,000,000) 1,611,000,000
Stage 1 [Member] | Increase Decrease Through Other Movements Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (204,000,000) (1,000,000)
Stage 1 [Member] | Other impairment losses [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (283,000,000) (1,782,000,000)
Stage 1 [Member] | Loans And Advances At Amortized Cost At The End [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 298,793,000,000 363,234,000,000
Stage 2 [Member] | Loans And Advances At Amortized Cost At The Beginning [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 33,518,000,000 30,707,000,000
Stage 2 [Member] | Transfers Of Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 8,807,000,000 6,279,000,000
Stage 2 [Member] | Transfers from stage 1 to stage 2 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 15,843,000,000 13,546,000,000
Stage 2 [Member] | Transfers from stage 2 to stage 1 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (5,107,000,000) (5,656,000,000)
Stage 2 [Member] | Transfers to stage 3 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (2,659,000,000) (2,698,000,000)
Stage 2 [Member] | Transfers from stage 3 to stage 1or 2 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 729,000,000 1,087,000,000
Stage 2 [Member] | Net Production Finnancial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (827,000,000) (2,739,000,000)
Stage 2 [Member] | Writteoffs [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (2,000,000) (349,000,000)
Stage 2 [Member] | Changes In Model    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Stage 2 [Member] | Foreign Exchange Loss [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (2,342,000,000) 35,000,000
Stage 2 [Member] | Increase Decrease Through Other Movements Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 827,000,000 (27,000,000)
Stage 2 [Member] | Other impairment losses [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (190,000,000) (388,000,000)
Stage 2 [Member] | Loans And Advances At Amortized Cost At The End [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 30,601,000,000 33,518,000,000
Stage 3 [Member] | Loans And Advances At Amortized Cost At The Beginning [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 15,959,000,000 16,359,000,000
Stage 3 [Member] | Transfers Of Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 3,128,000,000 2,741,000,000
Stage 3 [Member] | Transfers from stage 1 to stage 2 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Stage 3 [Member] | Transfers from stage 2 to stage 1 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Stage 3 [Member] | Transfers to stage 3 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 4,359,000,000 4,269,000,000
Stage 3 [Member] | Transfers from stage 3 to stage 1or 2 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (1,231,000,000) (1,527,000,000)
Stage 3 [Member] | Net Production Finnancial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 102,000,000 246,000,000
Stage 3 [Member] | Writteoffs [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (2,944,000,000) (3,407,000,000)
Stage 3 [Member] | Changes In Model    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Stage 3 [Member] | Foreign Exchange Loss [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (1,157,000,000) 16,000,000
Stage 3 [Member] | Increase Decrease Through Other Movements Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 511,000,000 15,000,000
Stage 3 [Member] | Other impairment losses [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 270,000,000 (11,000,000)
Stage 3 [Member] | Loans And Advances At Amortized Cost At The End [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 14,678,000,000 15,959,000,000
Total Member | Loans And Advances At Amortized Cost At The Beginning [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 412,711,000,000 399,347,000,000
Total Member | Transfers Of Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Transfers from stage 1 to stage 2 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Transfers from stage 2 to stage 1 not credit impaired [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Transfers to stage 3 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Transfers from stage 3 to stage 1or 2 [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Net Production Finnancial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 15,395,000,000 17,804,000,000
Total Member | Writteoffs [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (2,949,000,000) (3,908,000,000)
Total Member | Changes In Model    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 0 0
Total Member | Foreign Exchange Loss [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (24,970,000,000) 1,662,000,000
Total Member | Increase Decrease Through Other Movements Financial Assets [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels 1,134,000,000 (13,000,000)
Total Member | Other impairment losses [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels (204,000,000) (2,180,000,000)
Total Member | Loans And Advances At Amortized Cost At The End [Member]    
Disclosure Of Loans And Advances At Amortized Cost Line Items    
Loans And Advances By Levels € 344,072,000,000 € 412,711,000,000