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IFRSs not yet adopted (Details Textual) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Impairment loss | € 1,701 | € 913 |  |
Equity | 51,073 | € 48,079 | € 53,086 | € 57,409
Right-of-use assets | 5,700 |  |  |
Lease liabilities | 5,800 |  |  |
Followers [Member] |  |  |  |
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Working Interest | 2,000 |  |  |
Eni Working Interest | € 3,800 |  |  |
Intra Group Related Balances [Member] |  |  |  |
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Description of how future recovery or reversal of regulatory deferral account balances is affected by risks and uncertainty | For exposures arising from intragroup transactions, the recovery rate is assumed to be 100% in consideration of the possibility of providing for capital contribution to the investees in order to guarantee their solvency. |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Expected Credit Loss Model [Member] |  |  |  |
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Equity | € (43) |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Sales method [Member] |  |  |  |
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Equity | (103) |  |  |
Increase (decrease) due to application of IFRS 9 [Member] | Expected Credit Loss Model [Member] |  |  |  |
Disclosure Of Ifrs Not Yet Adopted [Line Items] |  |  |  |
Impairment loss | € 356 |  |  |

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- Definition the lease liability corresponding to the eni working interest + References No definition available. + Details
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- Definition the lease liability corresponding to the followers' working interest + References No definition available. + Details
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- Definition The description of how the future recovery or reversal of regulatory deferral account balances is affected by risks and uncertainty. [Refer: Regulatory deferral account balances [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2018-01-01 -Paragraph 30 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2018-03-01&anchor=para_30_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2018-03-01&anchor=para_24_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2018-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2018-03-01&anchor=para_32_a_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_a&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_b&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 + Details
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