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Business combinations and other significant transactions - Divestments - Additional Information (Details) € in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 19, 2023 EUR (€) | Jan. 10, 2023 EUR (€) NUMBER | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Business combinations and other significant transactions |  |  |  |  |
Cash consideration |  |  | € 420 |  |
Acquisition of interests in joint ventures |  |  | 580 |  |
Net financial liabilities |  |  | (180) | € 2,085 |
Cash and cash equivalents |  |  | 25 | 70 |
Capital gain realized from the sale of investments |  |  | 430 | € 483 | € 1
EniCorridor Srl (now SeaCorridor Srl) |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |
Acquisition of interests in joint ventures |  | € 580 |  |  |
Cash and cash equivalents |  |  | € 25 |  |
Proportion of ownership interest in joint venture (as a percent) |  | 50.10% |  |  |
Capital gains from the fair value measurement of the business combination |  | € 414 |  |  |
EniCorridor Srl (now SeaCorridor Srl) | Snam Group |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |
Cash and cash equivalents |  | € 25 |  |  |
Equity interest disposed (as a percent) |  | 49.90% | 49.90% |  |
Number of operating groups of international gas pipelines | NUMBER |  | 2 |  |  |
Net assets and liabilities derecognized |  | € 331 |  |  |
Net financial assets |  | 172 |  |  |
Capital gain realized from the sale of investments |  | 420 |  |  |
Realized exchange differences on translation from the disposal of investments |  | € 7 |  |  |
Exploration activities in Gabon |  |  |  |  |
Business combinations and other significant transactions |  |  |  |  |
Net financial assets | € 8 |  |  |  |
Capital gain realized from the sale of investments | € 7 |  |  |  |

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- Definition The amount of net assets and liabilities derecognised as of disposal date. + References No definition available. + Details
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- Definition The amount of net borrowings derecognised as of disposal date. + References No definition available. + Details
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- Definition The amount of net financial assets derecognised as of disposal date. + References No definition available. + Details
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- Definition The number of operating groups of international gas pipelines. + References No definition available. + Details
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- Definition The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B64 -Subparagraph p -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B64_p_ii&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
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