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Revenues (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items] |  |  |
Other Revenue From Compensation For Damages | € 9 | € 122 | € 36
Gain (loss) on sale of assets and business | 3,288 |  |
Area 4 [Member] |  |  |
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items] |  |  |
Sale of stake in assets and business | € 1,985 |  |
Percentage of sale of stake in assets and business | 25.00% |  |
Zohr project [Member] |  |  |
DisclosureOfAdditionalInformationExplanatoryLineItems [Line Items] |  |  |
Sale of stake in assets and business | € 1,281 |  |
Percentage of sale of stake in assets and business | 40.00% |  |

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