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Operating Costs and Non-underlying Items - Summary of Non-underlying Items Related to Gross Profit and Operating Costs (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-underlying Items [Line Items]      
Credit from early settlement of contingent consideration € 277    
Gain on business disposal 4,331 € 309  
Impairment of intangible asset 208    
Litigation charges 98 80  
Tax benefit recognized due to Tax Cuts and Jobs Act   € 578  
New US tax rate   21.00%  
Legal Cases in Relation to Investigations [Member]      
Non-underlying Items [Line Items]      
Litigation charges 50 € 80  
Argentina [member]      
Non-underlying Items [Line Items]      
Foreign exchange losses resulting from remeasurement     € 18
United Kingdom [Member] | Pension obligation [member]      
Non-underlying Items [Line Items]      
Litigation charges € 48