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Risks and uncertainties - Impact of COVID-19 pandemic (Details) € in Millions, m³ in Billions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 EUR (€) | Mar. 31, 2022 $ / bbl | Dec. 31, 2021 EUR (€) $ / bbl m³ | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
COVID-19 impact |  |  |  |  |
Percentage of increase (decrease) in oil price |  |  | 70.00% |  |
Brent price per bbl | $ / bbl |  | 130 | 71 |  |
Profit (loss) |  |  | € 5,840 | € (8,628) | € 155
Net cash provided from operating activities |  |  | 12,861 | € 4,822 | € 12,392
Increase (decrease) in net cash provided by operating activities |  |  | 8,000 |  |
Blue Stream |  |  |  |  |
COVID-19 impact |  |  |  |  |
Net assets (liabilities) | € 40 |  | € 40 |  |
% Ownership | 50.00% |  |  |  |
Russia |  |  |  |  |
COVID-19 impact |  |  |  |  |
Percentage of Eni's purchases of natural gas |  |  | 43.00% |  |
Contractual purchases of natural gas | m³ |  |  | 30 |  |
Contractual purchases of natural gas destined to Italy | m³ |  |  | 22 |  |

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