Costs of geological and geophysical studies

No definition available.

Name:	e_CostsOfGeologicalAndGeophysicalStudies
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disclosure Of Operating Expenses.

+ References

No definition available.

+ Details

Name:	e_DisclosureOfOperatingExpensesLineItems
Namespace Prefix:	e_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Limit of shares to be granted in share-based payment arrangement

+ References

No definition available.

+ Details

Name:	e_LimitOfSharesToBeGrantedInShareBasedPaymentArrangement
Namespace Prefix:	e_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Lock-up clause percentage

+ References

No definition available.

+ Details

Name:	e_LockUpClausePercentage
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of minimum operating lease payment.

+ References

No definition available.

+ Details

Name:	e_MinimumOperatingLeasePaymentsIas17
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of net provisions for contingencies.

+ References

No definition available.

+ Details

Name:	e_NetProvisionsForContingencies
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of annual awards

+ References

No definition available.

+ Details

Name:	e_NumberOfAnnualAwards
Namespace Prefix:	e_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of performance parameters

+ References

No definition available.

+ Details

Name:	e_NumberOfPerformanceParameters
Namespace Prefix:	e_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of shares that will vest after vesting period

+ References

No definition available.

+ Details

Name:	e_PercentageOfSharesThatWillVestAfterVestingPeriod
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The element represents about the share based payment arrangement lock-up clause term

+ References

No definition available.

+ Details

Name:	e_ShareBasedPaymentArrangementLockUpClauseTerm
Namespace Prefix:	e_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The element represents about the share based payment arrangement vesting term.

+ References

No definition available.

+ Details

Name:	e_ShareBasedPaymentArrangementVestingTerm
Namespace Prefix:	e_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average fair value of awarded shares

+ References

No definition available.

+ Details

Name:	e_WeightedAverageFairValueOfAwardedShares
Namespace Prefix:	e_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of fees paid or payable to the entity's auditors.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_AuditorsRemuneration
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of remuneration paid or payable to the entity's directors.

+ References

+ Details

Name:	ifrs-full_DirectorsRemunerationExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

+ Details

Name:	ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expense from share-based payment transactions with employees.

+ References

+ Details

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 53
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_53&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2019-01-01
-Paragraph 126
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_126&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expense arising from royalties.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_RoyaltyExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 171
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_171&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_TerminationBenefitsExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=e_LongTermMonetaryIncentivePlan20172019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=ifrs-full_LegalProceedingsProvisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=e_EnvironmentalLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Costs - Additional information (Details) € / shares in Units, € in Thousands, shares in Millions		12 Months Ended
	Aug. 13, 2017	Dec. 31, 2019 EUR (€) EquityInstruments € / shares	Dec. 31, 2018 EUR (€) EquityInstruments € / shares	Dec. 31, 2017 EUR (€) EquityInstruments € / shares	Apr. 13, 2017 item shares
Costs
Geological and geophysical costs of exploration activities		€ 275,000	€ 287,000	€ 273,000
Minimum operating lease payments recognised as expense			872,000	1,022,000
Research and development costs		194,000	197,000	185,000
Royalty expense		1,183,000	1,043,000	674,000
Net provisions for contingencies		858,000	1,120,000	886,000
Provisions for redundancy incentives expense		45,000	37,000	18,000
Defined contribution plans expense		99,000	95,000	90,000
Directors' remuneration expense		9,200	9,600	14,500
Statutory auditors remuneration expense		€ 613	€ 604	€ 760
Long-Term Monetary Incentive Plan 2017 - 2019
Costs
Number of annual awards \| item					3
Vesting period	3 years
Number of performance parameters \| item					2
Lock-up clause percentage					50.00%
Lock-up clause term	1 year
Number of other equity instruments granted in share-based payment arrangement \| EquityInstruments		1,759,273	1,517,975	1,719,061
Weighted average fair value of awarded shares \| € / shares		€ 9.88	€ 11.73	€ 7.99
Weighted average share price at grant date \| € / shares		€ 13.714	€ 14.246	€ 13.81
Expected dividend as percentage		6.10%	5.80%	5.80%
Expected volatility		19.00%	20.00%	25.00%
Expense from share-based payment transactions with employees		€ 9,000	€ 5,000	€ 400
Long-Term Monetary Incentive Plan 2017 - 2019 \| Minimum
Costs
Percentage of shares that will vest after vesting period					0.00%
Long-Term Monetary Incentive Plan 2017 - 2019 \| Maximum
Costs
Limit of shares to be granted in share-based payment arrangement \| shares					11
Percentage of shares that will vest after vesting period					180.00%
Provisions for litigations
Costs
Net provisions for contingencies		60,000	101,000	375,000
Environmental liabilities
Costs
Net provisions for contingencies		€ 329,000	€ 266,000	€ 200,000