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Note 21 - Financial liabilities at amortized cost - Debt Securities issued (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt securities issued Line Items    
Debt certificates, at amortized cost € 62,349 € 63,915
Issued in Euros [Member] | Promissory bills and notes    
Debt securities issued Line Items    
Debt certificates, at amortized cost 549 1,309
Issued in Euros [Member] | Non-convertible bonds and debentures at floating interest rates    
Debt securities issued Line Items    
Debt certificates, at amortized cost 10,084 9,418
Issued in Euros [Member] | Mortgage Covered bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost [1] 16,241 16,425
Issued in Euros [Member] | Hybrid financial instruments    
Debt securities issued Line Items    
Debt certificates, at amortized cost 1,091 807
Issued in Euros [Member] | Securitization bonds made by the Group    
Debt securities issued Line Items    
Debt certificates, at amortized cost 2,259 2,295
Issued in Euros [Member] | Other securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Euros [Member] | Subordinated Liabilities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 8,099 8,481
Issued in Euros [Member] | Convertible    
Debt securities issued Line Items    
Debt certificates, at amortized cost 4,500 4,500
Issued in Euros [Member] | Convertible perpetual securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 4,500 4,500
Issued in Euros [Member] | Convertible subordinated bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Euros [Member] | Non-Convertible    
Debt securities issued Line Items    
Debt certificates, at amortized cost 3,599 3,981
Issued in Euros [Member] | Preferred Stock Member [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 107 107
Issued in Euros [Member] | Other subordinated liabilities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 3,492 3,875
Issued in Euros [Member] | Total [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 38,323 38,735
Issued in Foreign Currency [Member] | Promissory bills and notes    
Debt securities issued Line Items    
Debt certificates, at amortized cost 3,102 3,157
Issued in Foreign Currency [Member] | Non-convertible bonds and debentures at floating interest rates    
Debt securities issued Line Items    
Debt certificates, at amortized cost 10,441 11,109
Issued in Foreign Currency [Member] | Mortgage Covered bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 596 650
Issued in Foreign Currency [Member] | Hybrid financial instruments    
Debt securities issued Line Items    
Debt certificates, at amortized cost 1,517 1,809
Issued in Foreign Currency [Member] | Securitization bonds made by the Group    
Debt securities issued Line Items    
Debt certificates, at amortized cost 42 47
Issued in Foreign Currency [Member] | Other securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Foreign Currency [Member] | Subordinated Liabilities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 8,328 8,407
Issued in Foreign Currency [Member] | Convertible    
Debt securities issued Line Items    
Debt certificates, at amortized cost 859 2,085
Issued in Foreign Currency [Member] | Convertible perpetual securities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 859 2,085
Issued in Foreign Currency [Member] | Convertible subordinated bonds    
Debt securities issued Line Items    
Debt certificates, at amortized cost 0 0
Issued in Foreign Currency [Member] | Non-Convertible    
Debt securities issued Line Items    
Debt certificates, at amortized cost 7,469 6,323
Issued in Foreign Currency [Member] | Preferred Stock Member [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 76 55
Issued in Foreign Currency [Member] | Other subordinated liabilities    
Debt securities issued Line Items    
Debt certificates, at amortized cost 7,393 6,268
Issued in Foreign Currency [Member] | Total [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost 24,026 25,180
Total [Member] | Total [Member]    
Debt securities issued Line Items    
Debt certificates, at amortized cost € 62,349 € 63,915
[1]

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