Finance debt (Tables)
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12 Months Ended |
Dec. 31, 2025 |
| Disclosure of detailed information about borrowings [line items] |
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| Schedule of finance debt |
| | | | | Current portion of long-term debt | Long-term debt | | | Current portion of long-term debt | Long-term debt | | | | | | | | | | | | | | | | | | | | Sustainability-linked convertible bonds | | | | | | | | | Other financial institutions | | 775 | | 2,387 | | | | | | | 3,434 | | 28,502 | | | | |
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| Schedule of supplier finance arrangements |
| | Current SFAs and current portion of long-term SFAs | | Carrying amount at December 31, 2024 | | | | | | (2,249) | (2,249) | | | | | Currency translation differences | | (174) | (174) | Other non-monetary changes | (18) | | (2) | Carrying amount at December 31, 2025 | | | | Carrying amount at December 31, 2023 | | | | | | (844) | (844) | | | | | Currency translation differences | | | | Other non-monetary changes | (519) | | | Carrying amount at December 31, 2024 | | | |
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| Schedule of fair value of long-term debt |
| | | Ordinary bonds and sustainability-linked bonds | | | Convertible sustainability-linked bonds | | | | | | Other financial institutions | | | | | |
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| Schedule of changes in liabilities arising from financing activities |
| Long-term debt and current portion of long-term debt | | Long-term and current portion of long-term lease liabilities | | Carrying amount at December 31, 2024 | | | | | | (2,279) | (276) | (1,250) | (3,805) | Currency translation differences | (586) | | (484) | (869) | Changes in the scope of consolidation | | | | | Other non-monetary changes | (184) | | 981 | 1,559 | Carrying amount at December 31, 2025 | | | 5,700 | 34,202 | Carrying amount at December 31, 2023 | | | | | | (1,232) | (61) | (1,205) | (2,498) | Currency translation differences | | (303) | | | Changes in the scope of consolidation | | | | | Other non-monetary changes | | | | | Carrying amount at December 31, 2024 | | | | |
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| Currency |
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| Disclosure of detailed information about borrowings [line items] |
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| Schedule of finance debt |
| | | | Short-term debt (€ million) | Weighted average rate (%) | Long-term debt and current portion of long-term debt (€ million) | Weighted average rate (%) | Short-term debt (€ million) | Weighted average rate (%) | Long-term debt and current portion of long-term debt (€ million) | Weighted average rate (%) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Ordinary Bonds with sustainability-linked bonds |
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| Disclosure of detailed information about borrowings [line items] |
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| Schedule of finance debt |
| | Discount on bond issue and accrued expense | | | | | | | | | | | | | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | (2) | | | | | | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA | | | | | | | Eni SpA - Sustainability-linked | | | | | | | Eni SpA - Sustainability-linked | | | | | | | | | | | | | | | | | | | | | | | (21) | | | | | | | | | | | | Eni SpA | | | | | | | | | 7 | 858 | | | | | | (7) | | | | | Eni SpA | | | | | | | Eni USA Inc | | 3 | 343 | | | | Eni SpA - Sustainability-linked - Retail | | | | | | | | | | | | | | | | | | | | |
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| Convertible senior unsecured sustainability-linked bond |
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| Disclosure of detailed information about borrowings [line items] |
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| Schedule of finance debt |
| | Discount on bond issue and accrued expense | | | | | | | | | | | | Eni SpA - Convertible senior unsecured sustainability-linked bonds | | | | | | | of which financial liabilities | | | | | | | | | (1) | | | | |
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