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Taxation - Summary of Movements in Deferred Tax Asset (Liability) (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | € (707) | € (559)
Income statement | 752 | (54)
Other | (873) | (94)
Deferred tax asset (liability) ending balance | (828) | (707)
Pensions and similar obligations [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 766 | 557
Income statement | (16) | 7
Other | (434) | 202
Deferred tax asset (liability) ending balance | 316 | 766
Provisions and accruals [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 922 | 708
Income statement | (154) | 68
Other | (115) | 146
Deferred tax asset (liability) ending balance | 653 | 922
Goodwill and intangible assets [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | (1,928) | (1,301)
Income statement | 654 | (104)
Other | (378) | (523)
Deferred tax asset (liability) ending balance | (1,652) | (1,928)
Accelerated tax depreciation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | (870) | (752)
Income statement | 109 | (85)
Other | 82 | (33)
Deferred tax asset (liability) ending balance | (679) | (870)
Tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 131 | 123
Income statement | (36) | (6)
Other | 35 | 14
Deferred tax asset (liability) ending balance | 130 | 131
Fair value gains [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | (7) | (25)
Income statement | 104 | 14
Other | 3 | 4
Deferred tax asset (liability) ending balance | 100 | (7)
Fair value losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 29 | 16
Income statement | 65 | 8
Other | (70) | 5
Deferred tax asset (liability) ending balance | 24 | 29
Share-based payments [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 169 | 190
Income statement | (5) | (14)
Other | 30 | (7)
Deferred tax asset (liability) ending balance | 194 | 169
Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax asset (liability) beginning balance | 81 | (75)
Income statement | 31 | 58
Other | (26) | 98
Deferred tax asset (liability) ending balance | € 86 | € 81

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_g_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_g_i&doctype=Standard -URIDate 2016-03-31 + Details
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