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Investments (Details 5) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | € 13,447 | € 13,896
Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 182 | 151
Equity-accounted investments [Member] | Matrica SpA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 38 |
Industria Siciliana Acido Fosforico - ISAF SPA [Member] | Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 95 | 95
VIC CBM Ltd [Member] | Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 30 | 34
PetroBicentenario SA [Member] | Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 12 | 6
Societe Centrale Eletrique du Congo SA[member] | Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | 6 | 7
Other Related Parties [Member] | Equity-accounted investments [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Other non-current provisions | € 1 | € 9

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