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Investments (Details Textual) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Investments [Line Items] |  |  |
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity | € 58 |  |
Investments accounted for using equity method | € 7,044 | € 3,511 | € 4,040
Percentage of voting equity interests acquired | 69.60% |  |
Increase Through Write Up Of Assets | € 681 |  |
Nigeria LNG Ltd [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 651 | 99 |
Increase Through Write Up Of Assets | 511 |  |
Saudi European Petro chemical Co [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 144 | 13 |
Increase Through Write Up Of Assets | 130 |  |
Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 1,452 | 1,063 |
Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 5,497 | 2,332 |
Angola LNG Ltd [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 95 | 802 |
Angola LNG Ltd [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 1,106 | 802 |
Union Fenosa Gas SA [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | 335 | 350 |
Union Fenosa Gas SA [Member] | Joint ventures [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity | 15 |  |
Investments accounted for using equity method | 335 | 350 |
Novamont SpA [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity | 43 |  |
Investments accounted for using equity method | 67 | 71 |
Coral FLNG SA [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Additional Capital Contributed In Associates Accounted Under Equity Method | 48 |  |
Coral FLNG SA [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | € 102 | € 54 |
Commonwealth fusion system Llc [Member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Percentage of voting equity interests acquired | 33.72% |  |
Consideration transferred, acquisition-date fair value | € 42 |  |
Commonwealth fusion system Llc [Member] | Associates [member] |  |  |
Disclosure Of Investments [Line Items] |  |  |
Investments accounted for using equity method | € 42 |  |

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