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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]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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