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Transactions with related parties (Details 1) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | € 1,226 | € 1,378 | € 1,530
Payables |  | 95 | 85 | 97
Guarantees |  | 1,625 | 84 | 12
Charges |  | 1 | 141 | 50
Gains |  | 190 | 156 | 81
Income from equity instruments |  |  | 27 |
Joint ventures and associates [Member] | Discontinued operations [member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  |  |  | 5
Guarantees |  |  |  | 150
Unconsolidated entities controlled by Eni [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 61 | 46 | 51
Payables |  | 61 | 106 | 111
Charges |  |  | 1 |
Gains |  | 1 | 1 | 1
Entities controlled by the Government [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  |  |  | 27
Payables |  | 8 |  |
Charges |  | 3 | 3 |
Gains |  |  |  | 1
Financing Transactions With Related Parties [Member] | Continuing operations [member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 1,287 | 1,424 | 1,608
Payables |  | 164 | 191 | 208
Guarantees |  | 1,625 | 84 | 12
Charges |  | 4 | 145 | 50
Gains |  | 191 | 157 | 83
Income from equity instruments |  |  | 27 |
Financing Transactions With Related Parties [Member] | Discontinued operations [member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables, Discontinued operations |  |  |  | 5
Guarantees, Discontinued operations |  |  |  | 150
Financing Transactions With Related Parties [Member] | Continuing and Discontinued operations [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  |  |  | 1,613
Payables |  |  |  | 208
Guarantees |  |  |  | 162
Charges |  |  |  | 50
Gains |  |  |  | 83
CARDON IV SA [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 955 | 1,054 | 1,112
Gains |  | 86 | 96 | 65
Coral South FLNG D MCC [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Guarantees |  | 1,334 |  |
Angola LNG Ltd [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Guarantees |  | 233 |  |
Matrica SpA [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  |  | 125 | 209
Charges |  |  | 93 | 10
Gains |  | 9 | 9 | 11
Shatskmorneftegaz Sarl [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 101 | 69 | 63
Charges |  |  | 13 | 21
Gains |  | 6 | 4 |
Societe Centrale Electrique du Congo SA [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 66 | 78 | 94
Payables |  | 43 |  |
Charges |  |  | 18 |
Saipem Group [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Payables |  | 3 |  |
Guarantees |  | 56 | 82 |
Gains |  | 13 | 43 |
Income from equity instruments |  |  | 27 |
Coral FLNG SA [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 56 |  |
Gains |  | 71 |  |
Union Fenosa Gas SA [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Payables |  |  | 85 | 90
Eni BTC Ltd [Member] | Unconsolidated entities controlled by Eni [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Payables |  | 28 | 54 |
Servizi Fondo Bombole Metano SpA [Member] | Unconsolidated entities controlled by Eni [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables |  | 60 |  |
Payables |  | 9 |  |
Gains |  | 1 |  |
Other [Member] | Joint ventures and associates [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables | [1] | 48 | 52 | 52
Payables | [1] | 49 |  | 7
Guarantees | [1] | 2 | 2 | 12
Charges | [1] | 1 | 17 | 19
Gains | [1] | 5 | 4 | 5
Other [Member] | Joint ventures and associates [Member] | Discontinued operations [member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables | [1] |  |  | 5
Other [Member] | Unconsolidated entities controlled by Eni [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables | [1] | 1 | 46 | 51
Payables | [1] | 24 | 52 | 111
Charges | [1] |  | 1 |
Gains | [1] |  | 1 | 1
Other [Member] | Entities controlled by the Government [Member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Receivables | [1] |  |  | 27
Payables | [1] | 8 |  |
Charges | [1] | € 3 | € 3 |
Gains | [1] |  |  | 1
CEPA V Due [Member] | Joint ventures and associates [Member] | Discontinued operations [member] |  |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |  |
Guarantees |  |  |  | € 150
[1] | Each individual amount included herein was lower than &euro;50 million.

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