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Revenues (Details Textual) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€)
Disclosure Of Additional Information Explanatory [Line Items] |  |  |  |
Gain on sale of assets and businesses | € 454 | € 3,288 |  | € 14
Zohr project [Member] |  |  |  |
Disclosure Of Additional Information Explanatory [Line Items] |  |  |  |
Sale of stake in assets and business | € 428 | € 1,281 |  |
Percentage of sale of stake in assets and business | 10 | 40 | 40 |
Area 4 Mozambique [Member] |  |  |  |
Disclosure Of Additional Information Explanatory [Line Items] |  |  |  |
Gain on sale of assets and businesses | $ |  |  | $ 1,985 |
Proportion of owner interest sold |  | 25.00% | 25.00% |

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