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Operating Costs and Non-underlying Items - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Jul. 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of non underlying items [Abstract]        
Non-underlying items within operating profit before tax   € 3,176 € (543) € (823)
Acquisition and disposal-related costs   76 (159) (132)
Gain/(loss) on disposal of group companies € 4,331 4,331 334 (95)
Restructuring costs   (914) (638) (578)
Impairments and other one-off items   (317) (80) (18)
Tax on non-underlying items within operating profit   (259) 77 213
Non-underlying items within operating profit after tax   2,917 (466) (610)
Non-underlying items not in operating profit but within net profit before tax   154 (382)  
Premium paid on buyback of preference shares     (382)  
Share of gain on disposal of Spreads business in Portugal JV   32    
Net monetary gain arising from hyperinflationary economies   122    
Tax impact of non-underlying items not in operating profit but within net profit   (29) 578  
Tax on premium paid on buyback of preference shares (non deductible)   0 0 0
Impact of US tax reform   (29) 578  
Non-underlying items not in operating profit but within net profit after tax   125 196  
Non-underlying items after tax   3,042 (270) (610)
Attributable to:        
Non-controlling interest   18 (8) (9)
Shareholders' equity   € 3,024 € (262) € (601)