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Goodwill - Goodwill allocated to the cash-generating units (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill € 8,014 € 8,654  
Monitoring and Analytics [member]      
Goodwill [Line Items]      
Goodwill 1,246 1,360  
Sleep & Respiratory Care [Member]      
Goodwill [Line Items]      
Goodwill 1,915 2,071  
Goodwill [member]      
Goodwill [Line Items]      
Intangible assets and goodwill 8,014 8,654 € 8,503
Goodwill [member] | Image-Guided Therapy [Member]      
Goodwill [Line Items]      
Intangible assets and goodwill 2,610 2,673  
Goodwill [member] | Other (units carrying a non-significant goodwill balance) [Member]      
Goodwill [Line Items]      
Intangible assets and goodwill 2,244 2,550  
Goodwill [member] | Cash-generating units [member]      
Goodwill [Line Items]      
Intangible assets and goodwill € 8,014 € 8,654