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Operating Costs and Non-underlying Items - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Detail) - EUR (€) € in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of non underlying items [Abstract] |  |  |  |
Non-underlying items within operating profit before tax |  | € (543) | € (823) | € (796)
Acquisition and disposal-related costs |  | (159) | (132) | (105)
Gain/(loss) on disposal of group companies |  | 334 | (95) | (9)
Restructuring costs |  | (638) | (578) | (446)
Impairments and other one-off items |  | (80) | (18) | (236)
Tax on non-underlying items within operating profit |  | 77 | 213 | 180
Non-underlying items within operating profit after tax |  | (466) | (610) | (616)
Non-underlying items not in operating profit but within net profit before tax |  |  |  |
Premium paid on buy back of preference shares |  | (382) | 0 | 0
Tax impact of non-underlying items not in operating profit but within net profit |  | 578 | 0 | 0
Tax on premium paid on buy back of preference shares (non deductible) |  | 0 | 0 | 0
Impact of US tax reform | € (578) | 578 | 0 | 0
Non-underlying items not in operating profit but within net profit after tax |  | 196 | 0 | 0
Non-underlying items after tax |  | (270) | (610) | (616)
Attributable to: |  |  |  |
Non-controlling interest |  | (8) | (9) | (11)
Shareholders' equity |  | € (262) | € (601) | € (605)

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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_98_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Acquisition and disposal-related costs. + References No definition available. + Details
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- Definition Gain (loss) on disposal of group companies. + References No definition available. + Details
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