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Intangible assets excluding goodwill - Text Details (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]      
Intangible assets other than goodwill € 3,589 € 3,322 € 3,552
Brand names, customer relationships, technology and other intangible assets [Member]      
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]      
Weighted average expected remaining life 9.3 9.6  
Customer-related intangible assets [member]      
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]      
Intangible assets other than goodwill € 934 € 1,004 € 1,241
Customer-related intangible assets [member] | Sleep & Respiratory Care [Member]      
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]      
Intangible assets other than goodwill € 278 € 315  
Remaining amortisation period of intangible assets material to entity 5 6