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Guarantees, commitments and risks - Guarantees (Details) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Guarantees, commitments and risks |  |
Guarantees | € 8,884 | € 8,862
Consolidated subsidiaries |  |
Guarantees, commitments and risks |  |
Guarantees | 4,758 | 4,323
Investments in unconsolidated entities controlled by Eni |  |
Guarantees, commitments and risks |  |
Guarantees | 176 | 197
Joint ventures and associates |  |
Guarantees, commitments and risks |  |
Guarantees | 3,800 | 4,075
Others |  |
Guarantees, commitments and risks |  |
Guarantees | € 150 | € 267

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- Definition The total amount of the guarantees. + References No definition available. + Details
Name: | e_Guarantees
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
Name: | e_ClassesOfGuaranteedEntitiesAxis=ifrs-full_UnconsolidatedSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | e_ClassesOfGuaranteedEntitiesAxis=e_JointVenturesAndAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | e_ClassesOfGuaranteedEntitiesAxis=e_OthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |