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Impairment/reversal of tangible and intangible assets (Details 3) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	€ 1,204	€ 1,320
Europe [Member]
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	95
Gas & Power [Member]
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	932	1,025
Gas & Power [Member] | Country Of Domicile [Member]
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	835	835
Gas & Power [Member] | Foreign Gas Market [Member]
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	97	190
Gas & Power [Member] | Europe [Member]
DisclosureOfImpairmentOfAssetsExplanatoryLineItems [Line Items]
Goodwill	€ 95	€ 188

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No definition available.

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- Definition

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]]

+ References

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