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Inventories (Details Textual) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
InventoriesLineItems [Line Items] |  |
Current raw materials | € 2,565 | € 2,588
Other current inventories | 56 | 69
Inventories pledged as security for liabilities | 86 | 82
Increase decrease through gross value changes,inventories | 314 | (29)
Loss provisions,inventories in exploration and evaluation assets | 245 |
Other [Member] |  |
InventoriesLineItems [Line Items] |  |
Current raw materials | 1,640 | 1,903
Other current inventories | 56 | 69
Level 1 Of Fair Value Hierarchy [Member] |  |
InventoriesLineItems [Line Items] |  |
Other current inventories | 56 | 69
Exploration & Production Segment [Member] |  |
InventoriesLineItems [Line Items] |  |
Current raw materials | 1,441 | € 1,699
Loss provisions,inventories in exploration and evaluation assets | 191 |
Refining & Marketing segment [member] |  |
InventoriesLineItems [Line Items] |  |
Increase decrease through gross value changes,inventories | 192 |
Chemical [member] |  |
InventoriesLineItems [Line Items] |  |
Increase decrease through gross value changes,inventories | € 129 |

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