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Note 8 - Fair Value Transfer Between Levels - Assets (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Level 1 Of Fair Value Hierarchy Member | Financial Assets Held For Trading [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets € 1,460,000,000 € 74,000,000 € 1,171,000,000
Transfers Into Level 3 Of Fair Value Hierarchy Assets 11,000,000 0 2,000,000
Level 1 Of Fair Value Hierarchy Member | Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets 9,000,000 0 0
Transfers Into Level 3 Of Fair Value Hierarchy Assets 11,000,000 0 0
Level 1 Of Fair Value Hierarchy Member | Financial Assets at fair value through profit or loss      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets 143,000,000 0 0
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0 0 0
Level 1 Of Fair Value Hierarchy Member | Financial Assets At Fair Value Through Other Comprehensive Income [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets 484,000,000 6,000,000 134,000,000
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0 6,000,000 72,000,000
Level 1 Of Fair Value Hierarchy Member | Derivatives [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets 0 0 0
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0 0 0
Level 1 Of Fair Value Hierarchy Member | Total Member      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 1 Into Level 2 Of Fair Value Hierarchy Assets 2,096,000,000 79,000,000 1,305,000,000
Transfers Into Level 3 Of Fair Value Hierarchy Assets 23,000,000 6,000,000 74,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets Held For Trading [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 548,000,000 502,000,000 6,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 203,000,000 1,119,000,000 2,000,000
Level 2 Of Fair Value Hierarchy Member | Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0 2,000,000 67,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 4,000,000 23,000,000 9,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets at fair value through profit or loss      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0 0 0
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 0 0 0
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Fair Value Through Other Comprehensive Income [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 96,000,000 209,000,000 515,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 135,000,000 4,000,000 0
Level 2 Of Fair Value Hierarchy Member | Derivatives [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 8,000,000 26,000,000 52,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 0 0 0
Level 2 Of Fair Value Hierarchy Member | Total Member      
Disclosure Of Level Transfer Asets Line Items      
Transfers Into Level 3 Of Fair Value Hierarchy Assets 652,000,000 739,000,000 641,000,000
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 342,000,000 1,145,000,000 11,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets Held For Trading [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 98,000,000 160,000,000 2,000,000
TransfersIntoLevel1OfFairValueHierarchyAssets 4,000,000 1,000,000 0
Level 3 Of Fair Value Hierarchy Member | Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 17,000,000 44,000,000 24,000,000
TransfersIntoLevel1OfFairValueHierarchyAssets 0 0 0
Level 3 Of Fair Value Hierarchy Member | Financial Assets at fair value through profit or loss      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 0 0 0
TransfersIntoLevel1OfFairValueHierarchyAssets 0 1,000,000 0
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Fair Value Through Other Comprehensive Income [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 6,000,000 454,000,000 0
TransfersIntoLevel1OfFairValueHierarchyAssets 0 0 0
Level 3 Of Fair Value Hierarchy Member | Derivatives [Member]      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 0 10,000,000 49,000,000
TransfersIntoLevel1OfFairValueHierarchyAssets 0 0 118,000,000
Level 3 Of Fair Value Hierarchy Member | Total Member      
Disclosure Of Level Transfer Asets Line Items      
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 122,000,000 667,000,000 75,000,000
TransfersIntoLevel1OfFairValueHierarchyAssets € 4,000,000 € 2,000,000 € 118,000,000