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Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year € 3,511 € 4,040
Additions and subscriptions 120 507
Divestments and reimbursements (151) (462)
Share of profit of equity-accounted investments 124
Share of loss of equity-accounted investments (353)
Deduction for dividends (86)
Changes in the scope of consolidation 3,448 2
Currency translation differences (268)
Other changes 7
Book amount – end of the year 7,044 3,511
Previously stated [member]    
Disclosure Of Investments [Line Items]    
Book amount – beginning of the year   4,040
Book amount restated – beginning of the year 3,511 4,040
Book amount – end of the year   3,511
Increase (decrease) due to application of IFRS 15 and IFRS 9 [Member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year (37)  
Book amount – end of the year   (37)
Joint ventures [member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year 2,298 2,675
Additions and subscriptions 28 63
Divestments and reimbursements (3)  
Share of profit of equity-accounted investments 49
Share of loss of equity-accounted investments (340)
Deduction for dividends (41)
Changes in the scope of consolidation 3,448  
Currency translation differences (127)
Other changes 53
Book amount – end of the year 5,497 2,298
Joint ventures [member] | Previously stated [member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year 2,332 2,675
Book amount – end of the year   2,332
Joint ventures [member] | Increase (decrease) due to application of IFRS 15 and IFRS 9 [Member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year (34)  
Book amount – end of the year   (34)
Associates [member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year 1,060 1,197
Additions and subscriptions 92 444
Divestments and reimbursements (115) (462)
Share of profit of equity-accounted investments 66
Share of loss of equity-accounted investments (6)
Deduction for dividends (13)
Currency translation differences (128)
Other changes (35)
Book amount – end of the year 1,452 1,060
Associates [member] | Previously stated [member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year 1,063 1,197
Book amount – end of the year   1,063
Associates [member] | Increase (decrease) due to application of IFRS 15 and IFRS 9 [Member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year (3)  
Book amount – end of the year   (3)
Investments in unconsolidated entities controlled by Eni [Member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year 116 168
Divestments and reimbursements (33)  
Share of profit of equity-accounted investments 9
Share of loss of equity-accounted investments (7)
Deduction for dividends (32)
Changes in the scope of consolidation   2
Currency translation differences (13)
Other changes (11)
Book amount – end of the year 95 116
Investments in unconsolidated entities controlled by Eni [Member] | Previously stated [member]    
Disclosure Of Investments [Line Items]    
Book amount restated – beginning of the year € 116 168
Book amount – end of the year   € 116