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Goodwill - Goodwill allocated to the cash-generating units (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill - Text Details (Detail) [Line Items]      
Goodwill € 8,503 € 7,731  
Monitoring and Analytics [member]      
Goodwill - Text Details (Detail) [Line Items]      
Goodwill 1,354    
Sleep & Respiratory Care [Member]      
Goodwill - Text Details (Detail) [Line Items]      
Goodwill 1,925 1,819  
Goodwill [member]      
Goodwill - Text Details (Detail) [Line Items]      
Intangible assets and goodwill 8,503 7,731 € 8,898
Goodwill [member] | Image-Guided Therapy [Member]      
Goodwill - Text Details (Detail) [Line Items]      
Intangible assets and goodwill 2,357 2,242  
Goodwill [member] | Cash-generating units [member]      
Goodwill - Text Details (Detail) [Line Items]      
Intangible assets and goodwill 8,503 7,731  
Goodwill [member] | Other (units carrying a non-significant goodwill balance) [Member]      
Goodwill - Text Details (Detail) [Line Items]      
Intangible assets and goodwill € 2,867 2,321  
Goodwill [member] | Patient Care & Monitoring Solutions [Member]      
Goodwill - Text Details (Detail) [Line Items]      
Intangible assets and goodwill   € 1,349