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Revenues and other income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues and other income |  |  |
Recovery of cost share of right-of-use assets pertaining to partners of unincorporated joint operations | € 281 | € 357 | € 368

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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 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