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Exploration for evaluation of oil&gas resources (Details) € in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Dec. 31, 2018 USD ($)
Disclosure Of Exploration And Evaluation Of Oil And Gas Resources [Line Items] |  |  |  |
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs | € 1,081 | € 995 |  |
Provision for decommissioning related to exploration activity and evaluation |  | 7,638 |  | $ 7,757
Exploration for evaluation of oil & gas resources [Member] |  |  |  |
Disclosure Of Exploration And Evaluation Of Oil And Gas Resources [Line Items] |  |  |  |
Revenues related to exploration activity and evaluation | 17 | 9 | € 4 |
- write-off of exploration and evaluation costs | 93 | 252 | 170 |
- costs of geological and geophysical studies | 287 | 273 | 204 |
Exploration expense for the year | 380 | 525 | 374 |
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs | 1,081 | 995 | 1,092 |
Tangible assets: capitalized exploration and evaluation costs | 1,267 | 1,371 | 1,905 |
Total tangible and intangible assets | 2,348 | 2,366 | 2,997 |
Provision for decommissioning related to exploration activity and evaluation | 77 | 81 | 118 |
Exploration expenditure (net cash used in investing activivties) | 463 | 442 | 417 |
Geological and geophysical costs (cash flow from operating activities) | 287 | 273 | 204 |
Total exploration effort | € 750 | € 715 | € 621 |

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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 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The cash flows from (used in) 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, classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_119&doctype=Standard -URIDate 2018-03-16 + Details
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