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Net reversal (impairment) of tangible and intangible assets (Details 1) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  | € 862 | € 1,067
Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Impairment Loss Recognized Tax Effects |  |  |
Exploration & Production [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss | 1,025 | 650 | 740
Exploration & Production [Member] | Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Impairment Loss Recognized Tax Effects |  |  |
Gas And Power [Member] | Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Impairment Loss Recognized Tax Effects |  |  |
Refining & Marketing and Chemical [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss | 193 | 131 | 120
Refining & Marketing and Chemical [Member] | Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |
Impairment Loss Recognized Tax Effects |  |  |
Corporate And Other Activities [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss | 18 | € 25 | € 40
Corporate And Other Activities [Member] | Property, Plant and Equipment [Member] |  |  |
Disclosure Of Impairment Of Assets Explanatory [Line Items] |  |  |
Impairment loss recognised in profit or loss |  |  |

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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_126_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_129_a&doctype=Standard -URIDate 2018-03-16 + Details
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