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Acquisitions and Disposals - Summary of Effect of Acquisitions on Consolidated Balance Sheet (Detail) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Detailed Information about Business Combination [Line Items]
Net assets acquired	€ 2,423	€ 929	€ 999
Non-controllinginterest	(50)
Goodwill	16,881	17,624
Total consideration	4,912	2,069	2,011
Subsidiaries [Member]
Disclosure of Detailed Information about Business Combination [Line Items]
Goodwill	€ 2,539	€ 1,140	€ 1,012

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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]]

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The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]

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The amount of non-controlling interest in the acquiree recognised at the acquisition date for business combinations in which the acquirer holds less than 100 per cent of the equity interests in the acquiree at the acquisition date. [Refer: Business combinations [member]]

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