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Impairment/reversal of tangible and intangible assets (Details 2) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |
Reversals | € 1,055 | € 1,153
Tax effects | (200) | (346)
Reversals net of the relevant tax effects | 855 | 807
Property Plant And Equipment [Member] | Exploration & Production [Member] |  |
Statement Line Items [Line Items] |  |
Reversals | 776 | 1,055
Tax effects | (171) | (315)
Reversals net of the relevant tax effects | 605 | 740
Property Plant And Equipment [Member] | Gas & Power [Member] |  |
Statement Line Items [Line Items] |  |
Reversals | 202 | 86
Tax effects | (5) | (28)
Reversals net of the relevant tax effects | 197 | 58
Property Plant And Equipment [Member] | Refining & Marketing and Chemical [Member] |  |
Statement Line Items [Line Items] |  |
Reversals | 77 | 12
Tax effects | (24) | (3)
Reversals net of the relevant tax effects | € 53 | € 9

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- Definition The net amount of impairment losses reversed after deducting the related tax effects. + References No definition available. + Details
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- Definition The amount of reversal of impairment loss recognised in profit or loss. [Refer: Reversal of impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_b&doctype=Standard -URIDate 2017-03-09 + Details
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