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Exploration for evaluation of oil&gas resources (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Exploration for evaluation of oil&gas resources |  |  |
Revenues related to exploration activity and evaluation |  | € 34 | € 17
- write-off of exploration and evaluation costs | € 314 | 214 | 93
- costs of geological and geophysical studies | 196 | 275 | 287
Exploration expense for the year | 510 | 489 | 380
Intangible assets: proved and unproved exploration licence and leasehold property acquisition costs | 888 | 1,031 | 1,081
Tangible assets: capitalized exploration and evaluation costs | 1,341 | 1,563 | 1,267
Total tangible and intangible assets | 2,229 | 2,594 | 2,348
Provision for decommissioning related to exploration activity and evaluation | 93 | 109 | 77
Exploration expenditure (net cash used in investing activities) | 283 | 586 | 463
Geological and geophysical costs (cash flow from operating activities) | 196 | 275 | 287
Total exploration effort | € 479 | € 861 | € 750

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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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_119&doctype=Standard -URIDate 2020-01-01 + Details
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