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Note 7 - Fair Value - Financial Instruments At Fair Value By Levels - Assets (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets € 753,824,000,000 € 698,690,000,000
Cash And Cash Balances In Central Banks And Others [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 65,686,000,000 44,111,000,000
Cash And Cash Balances In Central Banks And Others [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Cash And Cash Balances In Central Banks And Others [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 191,000,000 192,000,000
Financial Assets Held For Trading [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 30,604,000,000 31,135,000,000
Financial Assets Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 86,964,000,000 70,045,000,000
Financial Assets Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,763,000,000 1,508,000,000
Financial Assets Held For Trading [Member] | Loans and advances at fair value [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 2,483,000,000 697,000,000
Financial Assets Held For Trading [Member] | Loans and advances at fair value [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 33,848,000,000 32,321,000,000
Financial Assets Held For Trading [Member] | Loans and advances at fair value [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,261,000,000 1,285,000,000
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 15,246,000,000 18,076,000,000
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 11,304,000,000 8,178,000,000
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 89,000,000 55,000,000
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 5,751,000,000 8,832,000,000
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 28,000,000 0
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 82,000,000 59,000,000
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 7,124,000,000 3,530,000,000
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 41,785,000,000 29,546,000,000
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 331,000,000 109,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,629,000,000 4,305,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 2,224,000,000 92,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,145,000,000 1,160,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances at fair value [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 152,000,000 82,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances at fair value [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances at fair value [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 538,000,000 1,038,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 205,000,000 91,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 45,000,000 19,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,477,000,000 4,223,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 2,019,000,000 1,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 562,000,000 103,000,000
Financial assets designated at fair value through profit or loss [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 925,000,000 1,214,000,000
Financial assets designated at fair value through profit or loss [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 172,000,000 0
Financial assets designated at fair value through profit or loss [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances at fair value [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances at fair value [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances at fair value [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 925,000,000 1,214,000,000
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 172,000,000 0
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 57,066,000,000 50,896,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 12,129,000,000 9,203,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 849,000,000 1,084,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances at fair value [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 33,000,000 33,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances at fair value [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances at fair value [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 0 0
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 55,780,000,000 49,070,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 11,990,000,000 9,057,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 452,000,000 604,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 1,254,000,000 1,794,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 139,000,000 146,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 397,000,000 480,000,000
Financial Assets at amortized cost [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 32,880,000,000 29,391,000,000
Financial Assets at amortized cost [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 26,566,000,000 217,279,000,000
Financial Assets at amortized cost [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 393,273,000,000 196,119,000,000
Derivatives Hedge accounting [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 153,000,000 44,000,000
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets 2,370,000,000 1,685,000,000
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Assets Line Items    
Assets € 8,000,000 € 0