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Other information - Additional Information (Details) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 EUR (€) company project | Dec. 31, 2019 EUR (€) | Dec. 31, 2021 EUR (€)
Other information |  |  |
Consideration transferred, acquisition-date fair value | € 112 | € 5 | € 2,222
Agip Oil Ecuador BV |  |  |
Other information |  |  |
Percentage of ownership interest divested |  | 100.00% |
Evolvere |  |  |
Other information |  |  |
Percentage of voting equity interests acquired | 70.00% |  |
Consideration transferred, acquisition-date fair value | € 97 |  |
Cash and cash equivalents in subsidiary or businesses acquired or disposed | 3 |  |
Companies holding authorization rights for wind projects |  |  |
Other information |  |  |
Consideration transferred, acquisition-date fair value | € 12 |  |
Number of companies acquired | company | 3 |  |
Number of wind projects to be constructed in Puglia | project | 3 |  |
SEA SpA |  |  |
Other information |  |  |
Percentage of voting equity interests acquired |  | 60.00% |
Petroven Srl |  |  |
Other information |  |  |
Percentage of voting equity interests acquired |  | 32.00% |

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