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Intangible assets (Details 1) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Intangible exploration and evaluation assets | € 995 | € 1,092 | € 735
Proved license and leasehold property [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Intangible exploration and evaluation assets | 403 | 497 |
Unproved license and leasehold property [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Intangible exploration and evaluation assets | 586 | 579 |
Other mineral interests [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Intangible exploration and evaluation assets | € 6 | € 16 |

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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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