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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, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 28,401  
Ending balance 29,493 € 28,401
Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 31,906 30,793
Hyperinflation restatement to 1 January 2018 272  
Acquisitions of group companies 1,307 5,267
Disposals of group companies (2)  
Reclassification to held for sale (283) (2,311)
Reclassification from held for sale 9 28
Additions 203 154
Disposals (15) (79)
Currency retranslation 4 (1,946)
Hyperinflationary adjustment 140  
Ending balance 33,541 31,906
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (3,505) (3,360)
Hyperinflation restatement to 1 January 2018 (3)  
Amortisation/impairment for the year (556) (365)
Disposals 14 79
Currency retranslation 4 141
Hyperinflationary adjustment (2)  
Ending balance (4,048) (3,505)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 16,881  
Ending balance 17,341 16,881
Goodwill [member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 18,042 18,789
Hyperinflation restatement to 1 January 2018 244  
Acquisitions of group companies 470 2,557
Disposals of group companies (1)  
Reclassification to held for sale (227) (2,228)
Reclassification from held for sale   28
Currency retranslation (151) (1,104)
Hyperinflationary adjustment 125  
Ending balance 18,502 18,042
Goodwill [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (1,161) (1,165)
Currency retranslation   4
Ending balance (1,161) (1,161)
Indefinite-life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 10,261  
Ending balance 11,035 10,261
Indefinite-life intangible assets [Member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 10,275 8,358
Hyperinflation restatement to 1 January 2018 25  
Acquisitions of group companies 825 2,622
Disposals of group companies (1)  
Reclassification to held for sale (55) (82)
Reclassification from held for sale 9  
Currency retranslation 156 (623)
Hyperinflationary adjustment 13  
Ending balance 11,247 10,275
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 (14) (13)
Amortisation/impairment for the year (198)  
Currency retranslation   (1)
Ending balance (212) (14)
Finite-life intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 862  
Ending balance 762 862
Finite-life intangible assets [Member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 2,499 2,578
Hyperinflation restatement to 1 January 2018 3  
Reclassification to held for sale (1) (1)
Additions 201 153
Disposals   (78)
Currency retranslation (15) (153)
Hyperinflationary adjustment 2  
Ending balance 2,689 2,499
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 (1,637) (1,484)
Hyperinflation restatement to 1 January 2018 (3)  
Amortisation/impairment for the year (297) (324)
Disposals   78
Currency retranslation 12 93
Hyperinflationary adjustment (2)  
Ending balance (1,927) (1,637)
Software [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 397  
Ending balance 355 397
Software [Member] | Cost [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,090 1,068
Acquisitions of group companies 12 88
Additions 2 1
Disposals (15) (1)
Currency retranslation 14 (66)
Ending balance 1,103 1,090
Software [Member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (693) (698)
Amortisation/impairment for the year (61) (41)
Disposals 14 1
Currency retranslation (8) 45
Ending balance € (748) € (693)