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Guarantees, commitments and risks - Commitments and risks (Details) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Guarantees, commitments and risks |  |
Commitments | € 69,998 | € 74,338
Risks | 600 | 676
Commitments and risks | € 70,598 | € 75,014

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- Definition The amount of commitments and risks. + References No definition available. + Details
Name: | e_CommitmentsAndRisks
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | e_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of risks associated with the entity. + References No definition available. + Details
Name: | e_Risks
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant