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Intangible assets (Details 1) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Intangible Assets Explanatory [Line Items] |  |
Intangible exploration and evaluation assets | € 1,081 | € 995
Proved licence and leasehold property acquisition costs [Member] |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |
Intangible exploration and evaluation assets | 357 | 403
Unproved licence and leasehold property acquisition costs [Member] |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |
Intangible exploration and evaluation assets | 684 | 586
Other Mineral Interests [Member] |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |
Intangible exploration and evaluation assets | € 40 | € 6

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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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