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Property, plant and equipment (Details 7) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | € 63,158 | € 70,793 | € 68,005
Exploration & Production Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 56,833 | 64,428 |
Gas & Power Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 1,379 | 1,692 |
Refining & Marketing and Chemical segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 4,929 | 4,642 |
Corporate And Other Activities [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 341 | 368 |
Elimination of intragroup profits [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | (324) | (337) |
Gross carrying amount [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 183,777 | 197,272 |
Gross carrying amount [member] | Exploration & Production Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 152,608 | 165,559 |
Gross carrying amount [member] | Gas & Power Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 5,333 | 6,276 |
Gross carrying amount [member] | Refining & Marketing and Chemical segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 24,554 | 24,119 |
Gross carrying amount [member] | Corporate And Other Activities [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 1,866 | 1,886 |
Gross carrying amount [member] | Elimination of intragroup profits [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | (584) | (568) |
Accumulated impairment [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 120,619 | 126,479 |
Accumulated impairment [member] | Exploration & Production Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 95,775 | 101,131 |
Accumulated impairment [member] | Gas & Power Segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 3,954 | 4,584 |
Accumulated impairment [member] | Refining & Marketing and Chemical segment [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 19,625 | 19,477 |
Accumulated impairment [member] | Corporate And Other Activities [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | 1,525 | 1,518 |
Accumulated impairment [member] | Elimination of intragroup profits [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Property, plant and equipment, net | € (260) | € (231) |

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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