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Goodwill and Intangible Assets - Summary of Net Book Value Goodwill and Intangible Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance € 27,433  
Ending balance 28,401 € 27,433
Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 30,793 28,179
Acquisitions of group companies 5,267 2,287
Disposals of group companies   (85)
Reclassification to held for sale (2,311) (55)
Reclassification from held for sale 28  
Additions 154 233
Disposals (79) (43)
Currency retranslation (1,946) 277
Ending balance 31,906 30,793
Accumulated depreciation, amortisation and impairment [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance (3,360) (3,120)
Amortisation/impairment for the year (365) (310)
Disposals 79 43
Currency retranslation 141 27
Ending balance (3,505) (3,360)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 17,624  
Ending balance 16,881 17,624
Goodwill [member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 18,789 17,378
Acquisitions of group companies 2,557 1,140
Disposals of group companies   (2)
Reclassification to held for sale (2,228) (55)
Reclassification from held for sale 28  
Currency retranslation (1,104) 328
Ending balance 18,042 18,789
Goodwill [member] | Accumulated depreciation, amortisation and impairment [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance (1,165) (1,165)
Currency retranslation 4  
Ending balance (1,161) (1,165)
Indefinite-life intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 8,345  
Ending balance 10,261 8,345
Indefinite-life intangible assets [member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 8,358 7,444
Acquisitions of group companies 2,622 911
Disposals of group companies   (83)
Reclassification to held for sale (82)  
Additions   2
Currency retranslation (623) 84
Ending balance 10,275 8,358
Indefinite-life intangible assets [member] | Accumulated depreciation, amortisation and impairment [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance (13) (13)
Currency retranslation (1)  
Ending balance (14) (13)
Finite-life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 1,094  
Ending balance 862 1,094
Finite-life intangible assets [Member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 2,578 2,538
Reclassification to held for sale (1)  
Additions 153 225
Disposals (78) (42)
Currency retranslation (153) (143)
Ending balance 2,499 2,578
Finite-life intangible assets [Member] | Accumulated depreciation, amortisation and impairment [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance (1,484) (1,269)
Amortisation/impairment for the year (324) (291)
Disposals 78 42
Currency retranslation 93 34
Ending balance (1,637) (1,484)
Software [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 370  
Ending balance 397 370
Software [Member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance 1,068 819
Acquisitions of group companies 88 236
Additions 1 6
Disposals (1) (1)
Currency retranslation (66) 8
Ending balance 1,090 1,068
Software [Member] | Accumulated depreciation, amortisation and impairment [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]    
Beginning balance (698) (673)
Amortisation/impairment for the year (41) (19)
Disposals 1 1
Currency retranslation 45 (7)
Ending balance € (693) € (698)