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Taxation - Summary of Movements in Deferred Tax Asset (Liability) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
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