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Income (expense) from investments (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Dividend income | € 205 | € 143 | € 402
Gains (losses) on disposals of investments | 163 | (14) | 164
Fair Value Of The Option Embedded | 2 |  |
Other trading income (expense) | (33) | (183) | 10
Decreases increases in the provision for losses on investments from equity accounted investments | (38) | (33) | (6)
Equity Investments [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss, investment property |  | 162 |
Nigeria LNG Ltd [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Dividend income | 167 | 76 | 222
Snam SpA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Dividend income |  |  | 72
Gains (losses) on disposals of investments |  | € 32 | € 46
Percentage of ownership sold |  | 2.22% | 6.03%
Fair Value Of The Option Embedded |  |  | € 49
Number of shares in entity held by entity or by its subsidiaries or associates |  |  | 77,700,000
Saudi European Petrochemical Co [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Dividend income | € 21 | € 45 | € 69
Galp Energia SGPS SA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Dividend income |  |  | 21
Gains (losses) on disposals of investments |  |  | € 98
Percentage of ownership sold |  |  | 8.00%
Eni Hungaria Zrt and Eni Slovenjia doo [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  | € 11 |
Percentage of ownership sold |  | 100.00% |
Pokrovskoe Petroleum BV And Zagoryanska Petroleum BV [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  | € 6 |
Pokrovskoe Petroleum BV [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold |  | 30.00% |
Zagoryanska Petroleum BV [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold |  | 60.00% |
Eni Gas & Power NV and Eni Wind Belgium NV [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold | 100.00% |  |
Ceska Republika Sro [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  |  | € 32
Percentage of ownership sold |  |  | 100.00%
Eni Romania Srl [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  |  | € 31
Percentage of ownership sold |  |  | 100.00%
Ceska Rafinerska AS [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  |  | € 6
Percentage of ownership sold |  |  | 32.45%
Eni Slovensko Spol Sro [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  |  | € 1
Percentage of ownership sold |  |  | 100.00%
Inversora de Gas Cuyana SA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Gains (losses) on disposals of investments |  |  | € 47
Percentage of ownership sold |  |  | 76.00%
Distribudora de Gas Cuyana SA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold |  |  | 6.84%
Inversora de Gas del Centro SA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold |  |  | 25.00%
Distribudora de Gas del Centro SA [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Percentage of ownership sold |  |  | 31.35%
Union Fenosa Gas SA [Member] | Equity Investments [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss, investment property | € 35 | € 84 | € 49
Petro Sucre [Member] | Equity Investments [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss, investment property |  | 65 |
Genomatica Inc [Member] | Equity Investments [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss, investment property |  | € 13 |
Caspian Pipeline Consortium R [Member] |  |  |
DisclosureOfIncomeExpenseFromInvestmentsLineItems [Line Items] |  |  |
Decreases increases in the provision for losses on investments from equity accounted investments |  |  | € 10

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