Intangible assets (Details 3) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]
Goodwill	€ 1,204	€ 1,320
Gas & Power [Member]
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]
Goodwill	932	1,025
Exploration & Production [Member]
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]
Goodwill	179	202
Refining & Marketing [Member]
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]
Goodwill	€ 93	€ 93

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Name:	ifrs-full_Goodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant