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Investments (Details 2) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Investments [Line Items] |  |
Book value | € 1,228 |
Saipem SpA [Member] |  |
Disclosure Of Investments [Line Items] |  |
% of the investment | 30.99% | 31.00%
Joint ventures [member] | Saipem SpA [Member] |  |
Disclosure Of Investments [Line Items] |  |
Number of shares held | 308,767,968 |
% of the investment | 30.99% | 31.00%
Share price | € 3.265 |
Market value | € 1,008 |

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