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Investments - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments |  |  |
Additions and subscriptions | € 275 | € 2,992 |
Share of loss of equity-accounted investments | 1,733 | 184 |
Deduction for dividends | € 314 | 1,138 |
Percentage of reasonable changes in cost of capital | 1.00% |  |
Other investments | € 957 | 929 | € 919
Nigeria LNG Ltd |  |  |
Investments |  |  |
Other investments | 579 | 657 |
Saudi European Petrochemical Co |  |  |
Investments |  |  |
Other investments | 115 | € 146 |
Novamont SpA |  |  |
Investments |  |  |
Other investments | 77 |  |
Novis Renewables Holdings Llc & Novis Renewables Llc |  |  |
Investments |  |  |
Additions and subscriptions | 89 |  |
Associates | Abu Dhabi Oil Refining Co |  |  |
Investments |  |  |
Share of loss of equity-accounted investments | € 275 |  |
Associates | Novis Renewables Holdings Llc |  |  |
Investments |  |  |
Proportion of ownership interest acquired | 49.00% |  |
Associates | Finproject SpA |  |  |
Investments |  |  |
Proportion of ownership interest acquired | 40.00% |  |
Additions and subscriptions | € 72 |  |
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity | 44 |  |
Joint ventures | Lotte Versalis Elastomers Co Ltd |  |  |
Investments |  |  |
Additions and subscriptions | 38 |  |
Joint ventures | Var Energi AS |  |  |
Investments |  |  |
Share of loss of equity-accounted investments | 918 |  |
Deduction for dividends | 274 |  |
Joint ventures | Saipem SpA |  |  |
Investments |  |  |
Share of loss of equity-accounted investments | € 354 |  |
Percentage by which the fair value of investment is lower than the book value | 25.00% |  |
Joint ventures | Cardon IV SA |  |  |
Investments |  |  |
Share of loss of equity-accounted investments | € 46 |  |
Proportion of ownership interest in joint venture | 50.00% |  |
Joint ventures | Novis Renewables Llc |  |  |
Investments |  |  |
Proportion of ownership interest acquired | 50.00% |  |

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