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Financial assets held for trading (Details 2)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 4,596
Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 6,731
Financial assets, at fair value 6,552
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 859
Financial assets, at fair value 878
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | ITALY [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 523
Financial assets, at fair value € 529
External Rating By Moodys Grade Baa3
External Rating By Sp Grade BBB
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Other [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 336 [1]
Financial assets, at fair value € 349 [1]
External Rating By Moodys Grade from Aaa to Baa3 [1]
External Rating By Sp Grade from AAA to BBB- [1]
Quoted bonds issued by sovereign states, Floating rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 216
Financial assets, at fair value 205
Quoted bonds issued by sovereign states, Floating rate bonds [Member] | ITALY [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 130
Financial assets, at fair value € 129
External Rating By Moodys Grade Baa3
External Rating By Sp Grade BBB
Quoted bonds issued by sovereign states, Floating rate bonds [Member] | Other [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 86 [1]
Financial assets, at fair value € 76 [1]
External Rating By Moodys Grade from Aaa to Baa3 [1]
External Rating By Sp Grade from AAA to BBB- [1]
Quoted bonds issued by sovereign states [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 1,075
Financial assets, at fair value 1,083
Other Bonds, Fixed rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 2,949
Financial assets, at fair value 2,898
Other Bonds, Fixed rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by financial and insurance companies [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 1,270
Financial assets, at fair value € 1,269
External Rating By Moodys Grade from Aaa to Baa3
External Rating By Sp Grade from AAA to BBB-
Other Bonds, Fixed rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by industrial companies [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 1,628
Financial assets, at fair value € 1,581
External Rating By Moodys Grade from Aa2 to Baa3
External Rating By Sp Grade from AA to BBB-
Other Bonds, Fixed rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by supranational institutions [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 51
Financial assets, at fair value € 48
External Rating By Moodys Grade from A1 to Baa3
External Rating By Sp Grade from A+ to BBB-
Other Bonds, Floating rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 2,707
Financial assets, at fair value 2,571
Other Bonds, Floating rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by financial and insurance companies [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount 1,562
Financial assets, at fair value € 1,453
External Rating By Moodys Grade from Aaa to Baa3
External Rating By Sp Grade from AAA to BBB-
Other Bonds, Floating rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by industrial companies [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 987
Financial assets, at fair value € 976
External Rating By Moodys Grade from Aa2 to Baa2
External Rating By Sp Grade from AA to BBB
Other Bonds, Floating rate bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] | Quoted bonds issued by supranational institutions [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 158
Financial assets, at fair value € 142
External Rating By Moodys Grade from Aa3 to Baa3
External Rating By Sp Grade from AA- to BBB-
Other Bonds [Member] | Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member]  
Disclosure Of Financial Assets Held For Trading [Line Items]  
Notional amount € 5,656
Financial assets, at fair value € 5,469
[1] Individual amounts included herein are lower than €50 million.