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Note 10 - Financial assets and liabilities held for trading - Derivatives by type of risk / by product or by type of market (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading € 35,265 € 42,955 € 40,902
Derivative financial liabilities, held for trading 36,169 43,118 42,149
Notional Amount Total 2,659,246 2,092,945 1,872,373
Interest Rate [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 22,606 25,770 22,425
Derivative financial liabilities, held for trading 22,546 25,322 23,152
Notional Amount Total 2,152,490 1,556,150 1,289,986
Interest Rate [Member] | OTC Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 2,429 3,331 3,291
Derivative financial liabilities, held for trading 2,581 3,428 3,367
Notional Amount Total 212,554 217,958 208,175
Interest Rate [Member] | OTC Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 20,177 22,339 19,134
Derivative financial liabilities, held for trading 19,965 21,792 19,785
Notional Amount Total 1,916,920 1,296,183 1,069,909
Interest Rate [Member] | Organized Market Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 1 0
Derivative financial liabilities, held for trading 0 0 0
Notional Amount Total 600 1,311 0
Interest Rate [Member] | Organized Market Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 100 0
Derivative financial liabilities, held for trading 0 102 0
Notional Amount Total 22,416 40,698 11,902
Equity Risk [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 1,778 2,032 3,223
Derivative financial liabilities, held for trading 2,336 2,252 3,142
Notional Amount Total 95,573 90,655 108,108
Equity Risk [Member] | OTC Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 495 718 1,673
Derivative financial liabilities, held for trading 1,118 1,224 2,119
Notional Amount Total 34,140 44,837 65,951
Equity Risk [Member] | OTC Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 83 109 112
Derivative financial liabilities, held for trading 90 91 106
Notional Amount Total 8,158 5,312 4,535
Equity Risk [Member] | Organized Market Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 1,200 1,205 1,437
Derivative financial liabilities, held for trading 1,129 937 918
Notional Amount Total 48,644 36,795 34,475
Equity Risk [Member] | Organized Market Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 0 1
Derivative financial liabilities, held for trading 0 0 0
Notional Amount Total 4,631 3,712 3,147
Foreign Exchange And Gold Risk [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 10,371 14,872 14,706
Derivative financial liabilities, held for trading 10,729 15,179 15,367
Notional Amount Total 380,404 425,506 439,546
Foreign Exchange And Gold Risk [Member] | OTC Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 245 417 387
Derivative financial liabilities, held for trading 258 539 458
Notional Amount Total 24,447 27,583 41,706
Foreign Exchange And Gold Risk [Member] | OTC Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 10,092 14,436 14,305
Derivative financial liabilities, held for trading 10,430 14,624 14,894
Notional Amount Total 348,857 392,240 395,327
Foreign Exchange And Gold Risk [Member] | Organized Market Options [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 3 1
Derivative financial liabilities, held for trading 3 0 0
Notional Amount Total 104 175 109
Foreign Exchange And Gold Risk [Member] | Organized Market Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 34 16 13
Derivative financial liabilities, held for trading 37 16 16
Notional Amount Total 6,997 5,508 2,404
Credit Risk [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 489 261 500
Derivative financial liabilities, held for trading 517 338 441
Notional Amount Total 30,181 19,399 33,939
Credit Risk [Member] | Credit Default Swap [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 480 246 436
Derivative financial liabilities, held for trading 507 230 412
Notional Amount Total 27,942 15,788 30,283
Credit Risk [Member] | Credit Spread Option [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 0 0
Derivative financial liabilities, held for trading 0 0 0
Notional Amount Total 200 150 300
Credit Risk [Member] | Total Return Swap [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 9 2 0
Derivative financial liabilities, held for trading 9 108 28
Notional Amount Total 2,039 1,895 1,831
Credit Risk [Member] | Other [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 0 14 64
Derivative financial liabilities, held for trading 0 0 0
Notional Amount Total 0 1,565 1,526
Commodities Risk [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 3 6 31
Derivative financial liabilities, held for trading 3 6 37
Notional Amount Total 36 169 118
Other Risk [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 18 13 16
Derivative financial liabilities, held for trading 38 22 10
Notional Amount Total 561 1,065 675
Total [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 35,265 42,955 40,902
Derivative financial liabilities, held for trading 36,169 43,118 42,149
Notional Amount Total 2,659,246 2,092,945 1,872,373
Total [Member] | Of Which OTC Derivatives With Credit Institutions [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 21,016 26,438 23,385
Derivative financial liabilities, held for trading 22,804 28,005 28,343
Notional Amount Total 898,209 806,096 974,604
Total [Member] | Of Which OTC Derivatives With Other Financial Institutions [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 8,695 8,786 9,938
Derivative financial liabilities, held for trading 9,207 9,362 8,690
Notional Amount Total 1,548,919 1,023,174 688,880
Total [Member] | Of Which OTC Derivatives With Rest Of Counterparties [Member]      
Derivatives by type of risk / by product or by type of market Line Items      
Derivative financial assets held for trading 4,316 6,404 6,122
Derivative financial liabilities, held for trading 2,986 4,694 4,177
Notional Amount Total € 128,722 € 175,473 € 156,828