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Note 8 - Fair Value Transfer Between Levels - Assets (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
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 € 1,171
Transfers Into Level 3 Of Fair Value Hierarchy Assets 2
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 0
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 0
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 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 134
Transfers Into Level 3 Of Fair Value Hierarchy Assets 72
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 0
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
Transfers Into Level 3 Of Fair Value Hierarchy Assets 0
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 118
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 1,305
Transfers Into Level 3 Of Fair Value Hierarchy Assets 74
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 118
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 6
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 2
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 2
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 67
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 9
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 24
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 515
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 0
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 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 52
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 0
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets 49
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 641
Transfers Out Of Level 2 Into Level 1 Of Fair Value Hierarchy Assets 11
Transfers Out Of Level 3 Of Fair Value Hierarchy Assets € 75