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Other information (Details Textual) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of voting equity interests acquired 69.60%      
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities € 119  
Net Assets Excluded from Consolidation of Entities 2,486      
Cash and cash equivalents 10,836 [1] € 7,363 [1] € 5,674 [1] € 5,209
Value of Investments Recognized 3,498      
Cumulative gain (loss) on disposal of investments in equity instruments designated at fair value through other comprehensive income 889      
Exchange Rate Differences Net € 123      
Percentage of Stake held by Subsidiary 26.25%      
Proceeds from issue of ordinary shares € 145      
Cash Divested Net € 13      
Tigz Zrt [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of Stake held by Subsidiary 98.99%      
Tigz Dso [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of Stake held by Subsidiary 100.00%      
Lasmo sanga sanga [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Proceeds from issue of ordinary shares € 33      
Eni Croatia BV [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of Stake held by Subsidiary 100.00%      
Proceeds from issue of ordinary shares € 20      
Cash Divested Net € 15      
Eni Trinidad and Tobago Ltd [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of Stake held by Subsidiary 100.00%      
Proceeds from issue of ordinary shares € 10      
Mossi Ghisolfi Group [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Consideration transferred, acquisition-date fair value € 75      
Gas Supply Company [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Percentage of voting equity interests acquired 51.00%      
Thessalia SA [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Consideration transferred, acquisition-date fair value € 24      
Mestni Plinovodi distribucija plina doo [Member]        
Disclosure Of Notes And Other Explanatory Information Explanatory [Line Items]        
Consideration transferred, acquisition-date fair value 15      
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities € 1      
[1] Cash and cash equivalents as of December 31, 2018, include €19 million of cash and cash equivalents of consolidated subsidiaries held for sale that were reported in the item Assets held for sale in the balance sheet