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Investments (Details) - EUR (€) € in Millions | 12 Months Ended
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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

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