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Note 8 - Fair Value - Financial Instruments At Fair Value By Levels - Assets (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets € 736,176,000,000 € 697,737,000,000 € 675,675,000,000
Financial Assets Held For Trading [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 32,555,000,000 31,135,000,000 26,730,000,000
Financial Assets Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 73,856,000,000 69,092,000,000 61,969,000,000
Financial Assets Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,847,000,000 1,508,000,000 404,000,000
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 2,379,000,000 697,000,000 47,000,000
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 28,659,000,000 32,321,000,000 28,642,000,000
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,609,000,000 1,285,000,000 60,000,000
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 12,790,000,000 18,076,000,000 17,884,000,000
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 11,123,000,000 8,178,000,000 7,494,000,000
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 57,000,000 55,000,000 199,000,000
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 11,367,000,000 8,832,000,000 5,194,000,000
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 31,000,000 0 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 60,000,000 59,000,000 60,000,000
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 6,019,000,000 3,530,000,000 3,605,000,000
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 34,043,000,000 28,593,000,000 25,833,000,000
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 121,000,000 109,000,000 85,000,000
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 3,826,000,000 4,305,000,000 3,127,000,000
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 381,000,000 92,000,000 78,000,000
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 992,000,000 1,160,000,000 1,929,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 210,000,000 82,000,000 25,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 499,000,000 1,038,000,000 1,778,000,000
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 4,000,000 0 90,000,000
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 324,000,000 91,000,000 71,000,000
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 28,000,000 19,000,000 76,000,000
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 3,612,000,000 4,223,000,000 3,012,000,000
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 57,000,000 1,000,000 8,000,000
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 465,000,000 103,000,000 75,000,000
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 939,000,000 1,214,000,000 1,313,000,000
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 178,000,000 0 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 0
Financial Assets Designated At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial Assets Designated At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial Assets Designated At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 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 939,000,000 1,214,000,000 1,313,000,000
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 178,000,000 0 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 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 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 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 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 60,976,000,000 50,896,000,000 45,824,000,000
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 7,866,000,000 9,203,000,000 9,323,000,000
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 598,000,000 1,084,000,000 1,190,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 33,000,000 33,000,000 33,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 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 59,982,000,000 49,070,000,000 43,788,000,000
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 7,832,000,000 9,057,000,000 9,211,000,000
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 493,000,000 604,000,000 711,000,000
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 961,000,000 1,794,000,000 2,003,000,000
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 34,000,000 146,000,000 113,000,000
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 105,000,000 480,000,000 479,000,000
Derivatives Hedge accounting [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 53,000,000 30,000,000 223,000,000
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 2,250,000,000 2,192,000,000 2,454,000,000
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets € 15,000,000 € 11,000,000 € 3,000,000