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Investments (Details 1) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 7,044 | € 3,511 | € 4,040
Proportion of ownership interest in associate | 13.60% |  |
Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 1,452 | 1,063 |
Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | 5,497 | 2,332 |
Unconsolidated structured entities [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | 95 | 116 |
Eni BTC Ltd [Member] | Unconsolidated structured entities [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 31 | € 63 |
Proportion Of Ownership Interest In Investments In Unconsolidated Entities | 100.00% | 100.00% |
Saipem SpA [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 1,288 | € 1,413 |
Proportion of ownership interest in joint venture | 30.99% | 31.00% |
Saipem SpA [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 1,228 | € 1,413 |
Proportion of ownership interest in joint venture | 30.99% | 31.00% |
Union Fenosa Gas SA [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 335 | € 350 |
Proportion of ownership interest in joint venture | 50.00% | 50.00% |
Union Fenosa Gas SA [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 335 | € 350 |
Proportion of ownership interest in joint venture | 50.00% | 50.00% |
Petro Junin SA [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 47 | € 210 |
Proportion of ownership interest in joint venture | 40.00% | 40.00% |
Petro Junin SA [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 47 | € 210 |
Proportion of ownership interest in joint venture | 40.00% | 40.00% |
Gas Distribution Company of Thessaloniki [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 137 | € 137 |
Proportion of ownership interest in joint venture | 49.00% | 49.00% |
Lotte Versalis Elastomers Co Ltd [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 75 | € 114 |
Proportion of ownership interest in joint venture | 50.00% | 50.00% |
AET Raffineriebeteiligungsgesellschaft mbH [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 32 | € 32 |
Proportion of ownership interest in joint venture | 33.33% | 33.33% |
Angola LNG Ltd [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 95 | € 802 |
Proportion of ownership interest in associate |  | 13.60% |
Angola LNG Ltd [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 1,106 | € 802 |
Proportion of ownership interest in associate | 13.60% | 13.60% |
United Gas Derivatives Co [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 102 | € 54 |
Proportion of ownership interest in associate | 25.00% | 25.00% |
United Gas Derivatives Co [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 62 | € 82 |
Proportion of ownership interest in associate | 33.33% | 33.33% |
Novamont SpA [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 67 | € 71 |
Proportion of ownership interest in associate | 25.00% | 25.00% |
Coral FLNG SA [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 102 | € 54 |
Proportion of ownership interest in associate | 25.00% | 25.00% |
Other investments [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 73 | € 54 |
Other investments [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | 47 | 76 |
Other investments [Member] | Unconsolidated structured entities [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | 64 | € 53 |
CARDON IV SA [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 98 |  |
Proportion of ownership interest in joint venture | 50.00% |  |
Commonwealth fusion system Llc [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 42 |  |
Proportion of ownership interest in associate | 33.72% |  |
Var Energi AS [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Net carrying amount | € 3,498 |  |
Proportion of ownership interest in joint venture | 69.60% |  |

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