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Right-of-use assets and lease liabilities - Amounts recognized in the profit and loss account (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other income and revenues |  |
Income from remeasurement of lease liability | € 12 | € 6
Other income and revenues | 12 | 6
Purchases, services and other |  |
Short-term leases | 67 | 115
Low-value leases | 37 | 39
Variable lease payments not included in the measurement of lease liabilities | 7 | 16
Capitalised direct cost associated with self-constructed assets - tangible assets | (2) | (2)
Purchases, services and other | 109 | 168
Depreciation and impairments |  |
Depreciation of RoU leased assets | 928 | 999
Capitalised direct cost associated with self-constructed assets - tangible assets | (96) | (210)
Impairment losses of RoU leased assets | 47 | 41
Depreciation and impairments | 879 | 830
Finance income (expense) from leases |  |
Interests on lease liabilities | (347) | (378)
Capitalised finance expense of ROU leased assets - tangible assets | 7 | 17
Net currency translation differences on lease liabilities | 24 | (6)
Finance income (expense) from leases | € (316) | € (367)

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- Definition The amount of capitalized finance expense of ROU leased assets - tangible assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Capitalized direct cost associated with self-constructed tangible assets, relating to depreciation in relation to leases + References No definition available. + Details
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- Definition Capitalized direct cost associated with self-constructed tangible assets, relating to purchases, services and other in relation to leases + References No definition available. + Details
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- Definition n/a + References No definition available. + Details
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- Definition Depreciation and impairment recognised in profit or loss, right-of-use assets + References No definition available. + Details
Name: | e_DepreciationAndImpairmentRecognisedInProfitOrLossRightOfUseAssets
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net amount of finance income (cost) arising from leasing activities. + References No definition available. + Details
Name: | e_FinanceIncomeCostFromLeases
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finance income (expense) on leases + References No definition available. + Details
Name: | e_FinanceIncomeExpenseOnLeasesAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of impairment loss recognized in profit or loss for right-of-use assets. Always reported positively in XBRL. + References No definition available. + Details
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- Definition Income from remeasurement of lease liability + References No definition available. + Details
Name: | e_IncomeFromRemeasurementOfLeaseLiability
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Net exchange differences on lease liabilities recognised in profit or loss + References No definition available. + Details
Name: | e_NetExchangeDifferencesOnLeaseLiabilitiesRecognisedInProfitOrLoss
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Data Type: | xbrli:monetaryItemType
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- Definition Other income and revenues from leases + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition Purchases, services and other, relating to leases + References No definition available. + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
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