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Exploration for evaluation of oil&gas resources (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Exploration For Evaluation Of Oilgas Resources |  |  |
Revenues related to exploration activity and evaluation | € 9 | € 4 | € 68
- write-off of exploration and evaluation costs | 252 | 170 | 617
- other exploration costs | 273 | 204 | 254
Exploration expense for the year | 525 | 374 | 871
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs | 995 | 1,092 | 735
Tangible assets: capitalized exploration and evaluation costs | 1,860 | 2,818 | 2,637
Total tangible and intangible assets | 2,855 | 3,910 | 3,372
Provision for decommissioning related to exploration activity and evaluation | 81 | 118 | 131
Exploration expenditure (net cash used in investing activities) | 442 | 417 | 566
Geological and geophysical costs (cash flow from operating activities) | 273 | 204 | 254
Total exploration effort | € 715 | € 621 | € 820

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- Definition The amount of assets arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_24_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of exploration and evaluation assets recognised as intangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_119&doctype=Standard -URIDate 2017-03-09 + Details
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