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Financial assets held for trading (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Financial Assets Held For Trading [Line Items]      
Current financial assets at fair value through profit or loss, classified as held for trading € 6,552 [1]   € 6,012
Top of range [member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Nominal and Fair Value Credit Rating 50    
Eni Insurance DAC [Member] | Reclassification Due To Changes In Accounting Principles IFRS 9 [Member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Current financial assets at fair value through profit or loss, classified as held for trading   € 207  
Securities lending [member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Current financial assets at fair value through profit or loss, classified as held for trading 1,301    
Securities lending [member] | Reclassification Due To Changes In Accounting Principles IFRS 9 [Member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Current financial assets at fair value through profit or loss, classified as held for trading     € 845
Level 1 of fair value hierarchy [member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Financial assets, at fair value 6,362    
Level 2 of fair value hierarchy [member]      
Disclosure Of Financial Assets Held For Trading [Line Items]      
Financial assets, at fair value € 190    
[1] Income or expense were recognized in the profit and loss account within “Finance income (expense)”.