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Taxation - Summary of Movements in Deferred Tax Asset (Liability) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance € (828) € (707)
Income statement 82 752
Other (60) (873)
Deferred tax asset (liability) ending balance (806) (828)
Pensions and similar obligations [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 316 766
Income statement (26) (16)
Other 114 (434)
Deferred tax asset (liability) ending balance 404 316
Provisions and accruals [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 653 922
Income statement 193 (154)
Other (25) (115)
Deferred tax asset (liability) ending balance 821 653
Goodwill and intangible assets [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance (1,652) (1,928)
Income statement (154) 654
Other (105) (378)
Deferred tax asset (liability) ending balance (1,911) (1,652)
Accelerated tax depreciation [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance (679) (870)
Income statement 5 109
Other (5) 82
Deferred tax asset (liability) ending balance (679) (679)
Tax losses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 130 131
Income statement 11 (36)
Other (11) 35
Deferred tax asset (liability) ending balance 130 130
Fair value gains [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 100 (7)
Income statement 58 104
Other (3) 3
Deferred tax asset (liability) ending balance 155 100
Fair value losses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 24 29
Income statement (2) 65
Other   (70)
Deferred tax asset (liability) ending balance 22 24
Share-based payments [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 194 169
Income statement (14) (5)
Other (5) 30
Deferred tax asset (liability) ending balance 175 194
Other [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax asset (liability) beginning balance 86 81
Income statement 11 31
Other (20) (26)
Deferred tax asset (liability) ending balance € 77 € 86