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Revenues and other income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues and other income |  |  |
Recovery of cost share of right-of-use assets pertaining to partners of unincorporated joint operations | € 121 | € 204 | € 281

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- Definition The amount of recovery of cost share of right-of-use assets pertaining to partners of non-incorporated joint operations. + References No definition available. + Details
Name: | e_RecoveryOfCostShareOfRightOfUseAssetsPertainingToPartnersOfNonIncorporatedJointOperations
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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