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Note 22 - Financial liabilities at amortized cost - Debt Securities issued (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt securities issued Line Items      
Debt certificates, at amortized cost € 61,112 € 63,915 € 76,375
Issued in Euros [Member] | Promissory bills and notes      
Debt securities issued Line Items      
Debt certificates, at amortized cost 267 1,309 875
Issued in Euros [Member] | Non-convertible bonds and debentures at floating interest rates      
Debt securities issued Line Items      
Debt certificates, at amortized cost 9,638 9,418 8,766
Issued in Euros [Member] | Mortgage Covered bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost [1] 15,809 16,425 24,845
Issued in Euros [Member] | Hybrid financial instruments      
Debt securities issued Line Items      
Debt certificates, at amortized cost 814 807 468
Issued in Euros [Member] | Securitization bonds made by the Group      
Debt securities issued Line Items      
Debt certificates, at amortized cost 1,630 2,295 3,693
Issued in Euros [Member] | Other securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 142 0 0
Issued in Euros [Member] | Subordinated Liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 9,136 8,481 6,972
Issued in Euros [Member] | Convertible      
Debt securities issued Line Items      
Debt certificates, at amortized cost 5,490 4,500 4,070
Issued in Euros [Member] | Convertible perpetual securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 5,490 4,500 4,070
Issued in Euros [Member] | Convertible subordinated bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost 0 0 0
Issued in Euros [Member] | Non-Convertible      
Debt securities issued Line Items      
Debt certificates, at amortized cost 3,647 3,981 2,902
Issued in Euros [Member] | Preferred Stock Member [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 107 107 359
Issued in Euros [Member] | Other subordinated liabilities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 3,540 3,875 2,543
Issued in Euros [Member] | Total [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 37,436 38,735 45,619
Issued in Foreign Currency [Member] | Promissory bills and notes      
Debt securities issued Line Items      
Debt certificates, at amortized cost 3,237 3,157 382
Issued in Foreign Currency [Member] | Non-convertible bonds and debentures at floating interest rates      
Debt securities issued Line Items      
Debt certificates, at amortized cost 9,335 11,109 15,134
Issued in Foreign Currency [Member] | Mortgage Covered bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost 569 650 149
Issued in Foreign Currency [Member] | Hybrid financial instruments      
Debt securities issued Line Items      
Debt certificates, at amortized cost 1,455 1,809 2,059
Issued in Foreign Currency [Member] | Securitization bonds made by the Group      
Debt securities issued Line Items      
Debt certificates, at amortized cost 38 47 3,019
Issued in Foreign Currency [Member] | Other securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 544 0 0
Issued in Foreign Currency [Member] | Subordinated Liabilities [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 8,499 8,407 10,016
Issued in Foreign Currency [Member] | Convertible      
Debt securities issued Line Items      
Debt certificates, at amortized cost 873 2,085 1,548
Issued in Foreign Currency [Member] | Convertible perpetual securities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 873 2,085 1,548
Issued in Foreign Currency [Member] | Convertible subordinated bonds      
Debt securities issued Line Items      
Debt certificates, at amortized cost 0 0 0
Issued in Foreign Currency [Member] | Non-Convertible      
Debt securities issued Line Items      
Debt certificates, at amortized cost 7,626 6,323 8,467
Issued in Foreign Currency [Member] | Preferred Stock Member [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 74 55 620
Issued in Foreign Currency [Member] | Other subordinated liabilities      
Debt securities issued Line Items      
Debt certificates, at amortized cost 7,552 6,268 7,846
Issued in Foreign Currency [Member] | Total [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost 23,676 25,180 30,759
Total [Member] | Total [Member]      
Debt securities issued Line Items      
Debt certificates, at amortized cost € 61,112 € 63,915 € 76,375
[1]

(*) Including mortgage-covered bonds (see Appendix III).