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Transactions with related parties (Details) € in Thousands | 12 Months Ended
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Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 USD ($)
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | € 1,000 | € 50,000 | [1] | € 114,000 | [1] |
Payables and other liabilities |  | 134,000 | 21,000 | [1] | 25,000 | [1] |
Guarantees | $ |  |  |  |  |  |  | $ 3
Costs |  | 2,282,000 | 38,000 | [1] | 145,000 | [1] |
Revenues |  | 7,000 | 16,000 | [1] | 143,000 | [1] |
Other operating (expense) income |  |  | 1,000 | [1] |  |  | 47
Continuing and Discontinued Operation [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 864,000 | 910,000 |  | 1,095,000 |  |
Payables and other liabilities |  | 3,750,000 | 2,891,000 |  | 2,400,000 |  |
Guarantees |  | 2,588,000 | 8,603,000 |  | 8,399,000 |  |
Costs |  | 8,005,000 | 9,198,000 |  | 8,236,000 |  |
Revenues |  | 1,391,000 | 1,608,000 |  | 1,312,000 |  |
Other operating (expense) income |  | 319,000 | 331,000 |  | 247,000 |  |
Angola lNG supply services llc [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Guarantees |  | 177,000 |  |  |  |  |
Coral FLNG SA [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 14,000 |  |  |  |  |
Guarantees |  | 1,147,000 |  |  |  |  |
Revenues |  | 62,000 |  |  |  |  |
Joint ventures and associates [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 236,000 | 295,000 |  | 458,000 |  |
Payables and other liabilities |  | 2,848,000 | 1,731,000 |  | 1,152,000 |  |
Guarantees |  | 2,392,000 | 8,421,000 |  | 8,152 |  | 8,152
Costs |  | 4,513,000 | 5,349,000 |  | 4,417,000 |  |
Revenues |  | 335,000 | 412,000 |  | 317,000 |  |
Other operating (expense) income |  | 11,000 | 28,000 |  | 47,000 |  |
Joint ventures and associates [Member] | Agiba Petroleum Co [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 1,000 | 1,000 |  | 1,000 |  |
Payables and other liabilities |  | 96,000 | 83,000 |  | 50,000 |  |
Costs |  | 156,000 | 142,000 |  | 156,000 |  |
Joint ventures and associates [Member] | Coral FLNG SA [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  |  | 20,000 |  |  |  |
Payables and other liabilities |  |  | 4,000 |  |  |  |
Guarantees |  |  | 1,094,000 |  |  |  |
Revenues |  |  | 28,000 |  |  |  |
Joint ventures and associates [Member] | Gas Distribution Company of Thessaloniki [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 1,000 |  |  |  |  |
Payables and other liabilities |  | 18,000 |  |  |  |  |
Costs |  | 51,000 |  |  |  |  |
Joint ventures and associates [Member] | Saipem Group [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 75,000 | 63,000 |  | 64,000 |  |
Payables and other liabilities |  | 171,000 | 76,000 |  | 224,000 |  |
Guarantees |  | 793,000 | 7,270,000 |  | 8,094,000 |  |
Costs |  | 420,000 | 450,000 |  | 781,000 |  |
Revenues |  | 30,000 | 44,000 |  | 51,000 |  |
Joint ventures and associates [Member] | Karachaganak Petroleum Operating BV [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 27,000 | 36,000 |  | 47,000 |  |
Payables and other liabilities |  |  | 121,000 |  | 187,000 |  |
Costs |  |  | 951,000 |  | 918,000 |  |
Revenues |  |  |  |  | 27,000 |  |
Joint ventures and associates [Member] | Mellitah Oil & Gas BV [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 1,000 | 5,000 |  | 7,000 |  |
Payables and other liabilities |  |  | 220,000 |  | 134,000 |  |
Costs |  |  | 495,000 |  | 477,000 |  |
Revenues |  |  | 2,000 |  |  |  |
Joint ventures and associates [Member] | Petrobel Belayim Petroleum Co [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 56,000 | 86,000 |  | 225,000 |  |
Payables and other liabilities |  |  | 1,205,000 |  | 532,000 |  |
Costs |  |  | 3,168,000 |  | 1,940,000 |  |
Revenues |  |  | 8,000 |  | 2,000 |  |
Joint ventures and associates [Member] | Union Fenosa Gas SA [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 4,000 |  |  |  |  |
Payables and other liabilities |  | 7,000 |  |  |  |  |
Guarantees |  | 57,000 | 57,000 |  | 57,000 |  |
Costs |  |  | 3,000 |  |  |  |
Revenues |  | 123,000 | 202,000 |  | 94,000 |  |
Other operating (expense) income |  | 37,000 | 28,000 |  |  |  |
Joint ventures and associates [Member] | Var Energi AS [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 13,000 |  |  |  |  |
Payables and other liabilities |  | 100,000 |  |  |  |  |
Guarantees |  | 218,000 |  |  |  |  |
Joint ventures and associates [Member] | Other [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets | [1] | 44,000 | 84,000 |  |  |  |
Payables and other liabilities | [1] | 25,000 | 22,000 |  |  |  |
Guarantees | [1] |  |  |  | 1,000 |  |
Costs | [1] | 104,000 | 140,000 |  |  |  |
Revenues | [1] | 111,000 | 128,000 |  |  |  |
Other operating (expense) income | [1] | (26,000) |  |  | 47,000 |  |
Unconsolidated entities controlled by Eni [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 6,000 | 97,000 |  | 78,000 |  |
Payables and other liabilities |  | 23,000 | 24,000 |  | 17,000 |  |
Guarantees |  | 14,000 | 181,000 |  | 246,000 |  | $ 192
Costs |  | 13,000 | 14,000 |  | 8,000 |  |
Revenues |  | 7,000 | 14,000 |  | 12,000 |  |
Unconsolidated entities controlled by Eni [Member] | Other [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 93,000 | 20,000 |  | 9,000 | [1] |
Payables and other liabilities |  | 24,000 | 23,000 |  | 16,000 | [1] |
Guarantees |  | 196,000 | 7,000 |  | 51,000 | [1] |
Costs |  | 13,000 | 14,000 |  | 8,000 | [1] |
Revenues |  | 18,000 | 7,000 |  | 10,000 | [1] |
Unconsolidated entities controlled by Eni [Member] | Eni BTC Ltd [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Guarantees |  | 177,000 | 169,000 |  | 192,000 |  |
Unconsolidated entities controlled by Eni [Member] | Industria Siciliana Acido Fosforico - ISAF SPA [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 87,000 | 77,000 |  | 69,000 |  |
Payables and other liabilities |  | 1,000 | 1,000 |  | 1,000 |  |
Guarantees |  | 5,000 | 5,000 |  | 3,000 |  |
Revenues |  | 11,000 | 7,000 |  | 2,000 |  |
Joint ventures and associates And Unconsolidated entities controlled by Eni [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  |  | 392,000 |  | 536,000 |  |
Payables and other liabilities |  |  | 1,755,000 |  | 1,169,000 |  |
Guarantees |  |  | 8,602,000 |  | 8,398,000 |  |
Costs |  |  | 5,363,000 |  | 4,425,000 |  |
Revenues |  |  | 426,000 |  | 329,000 |  |
Other operating (expense) income |  |  | 28,000 |  | 47,000 |  |
Joint ventures and associates And Unconsolidated entities controlled by Eni [Member] | Continuing operations [member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 329,000 |  |  |  |  |
Payables and other liabilities |  | 2,872,000 |  |  |  |  |
Guarantees |  | 2,588,000 |  |  |  |  |
Costs |  | 4,526,000 |  |  |  |  |
Revenues |  | 353,000 |  |  |  |  |
Other operating (expense) income |  | 11,000 |  |  |  |  |
Entities controlled by the Government [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 494,000 | 478,000 |  | 383,000 |  |
Payables and other liabilities |  | 736,000 | 989,000 |  | 898,000 |  |
Guarantees |  |  | 1,000 |  | 1,000 |  |
Costs |  | 3,218,000 | 3,280,000 |  | 3,356,000 |  |
Revenues |  | 1,000,000 | 1,139,000 |  | 913,000 |  |
Other operating (expense) income |  | 308,000 | 303,000 |  | 200,000 |  |
Entities controlled by the Government [Member] | Groupement Sonatrach Agip and Organe Conjoint des Operations [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 40,000 | 39,000 |  | 176,000 |  |
Payables and other liabilities |  | 140,000 | 145,000 |  | 331,000 |  |
Costs |  | 229,000 | 530,000 |  | 423,000 |  |
Revenues |  | 34,000 | 42,000 |  | 70,000 |  |
Entities controlled by the Government [Member] | Other [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 25,000 |  |  | 43,000 | [1] |
Payables and other liabilities |  | 18,000 |  |  | 24,000 | [1] |
Costs |  | 34,000 |  |  | 37,000 | [1] |
Revenues |  | 45,000 |  |  | 68,000 | [1] |
Entities controlled by the Government [Member] | Enel Group [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 134,000 | 123,000 |  | 151,000 |  |
Payables and other liabilities |  | 151,000 | 187,000 |  | 254,000 |  |
Costs |  | 514,000 | 622,000 |  | 808,000 |  |
Revenues |  | 118,000 | 164,000 |  | 201,000 |  |
Other operating (expense) income |  | 227,000 | 285,000 |  | 182,000 |  |
Entities controlled by the Government [Member] | Snam Group [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 237,000 | 187,000 |  | 54,000 |  |
Payables and other liabilities |  | 289,000 | 351,000 |  | 1,000 |  |
Guarantees |  |  |  |  |  |  |
Costs |  | 1,184,000 | 1,221,000 |  | 4,000 |  |
Revenues |  | 109,000 | 85,000 |  |  |  |
Other operating (expense) income |  | (1,000) |  |  |  |  |
Entities controlled by the Government [Member] | Terna Group [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 26,000 | 35,000 |  | 44,000 |  |
Payables and other liabilities |  | 47,000 | 31,000 |  | 541,000 |  |
Costs |  | 231,000 | 212,000 |  | 2,032,000 |  |
Revenues |  | 150,000 | 154,000 |  | 113,000 |  |
Other operating (expense) income |  | 8,000 | 15,000 |  |  |  |
Entities controlled by the Government [Member] | GSE - Gestore Servizi Energetici [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 67,000 | 69,000 |  | 33,000 |  |
Payables and other liabilities |  | 85,000 | 219,000 |  | 46,000 |  |
Costs |  | 588,000 | 506,000 |  | 232,000 |  |
Revenues |  | 555,000 | 702,000 |  | 117,000 |  |
Other operating (expense) income |  | 74,000 | 2,000 |  | 13,000 |  |
Entities controlled by the Government [Member] | Italgas Group [Member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 5,000 | 14,000 |  | 58,000 |  |
Payables and other liabilities |  | 146,000 | 180,000 |  | 32,000 |  |
Guarantees |  |  | 1,000 |  |  |  |
Costs |  | 667,000 | 681,000 |  | 243,000 |  |
Revenues |  | 23,000 | 18,000 |  |  |  |
Other related parties [member] |  |  |  |  |  |  |
Disclosure of Transactions with Related Parties [Line Items] |  |  |  |  |  |  |
Receivables and other assets |  | 1,000 | 1,000 |  |  |  |
Payables and other liabilities |  | 2,000 | 2,000 |  | 2,000 |  |
Costs |  | 32,000 | 25,000 |  | € 32,000 |  |
Revenues |  | € 4,000 | € 1,000 |  |  |  |
[1] | Each individual amount included herein was lower than €50 million.

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