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Acquisitions and Disposals - Summary of Effect of Acquisitions on Consolidated Balance Sheet (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Detailed Information about Business Combination [Line Items]      
Net assets acquired € 815 € 2,423 € 929
Non-controlling interest (17) (50)  
Goodwill 17,341 16,881  
Total payment for acquisition 1,294 4,912 2,069
Exchange rate gain/ (loss) on cash flow hedge (100) 51 14
Total consideration 1,194 4,963 2,083
Subsidiaries [member]      
Disclosure of Detailed Information about Business Combination [Line Items]      
Goodwill € 496 € 2,539 € 1,140