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COVID-19 - Text Details (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
COVID-19 [Line Items]      
Purchase of treasury shares € 130 € 621 € 514
Share repurchase program 2019 [member]      
COVID-19 [Line Items]      
Purchase of treasury shares   € 1,500  
Unsecured EUR Bonds Due 2025/2030 [Member]      
COVID-19 [Line Items]      
Notional amount 1,000    
Unsecured EUR Bonds Due 30/03/2025 1 3/8% [Member]      
COVID-19 [Line Items]      
Notional amount € 500    
Bottom of range [member] | Ventilator production PP&E      
COVID-19 [Line Items]      
Useful life measured as period of time, property, plant and equipment 5 years    
Top of range [member] | Ventilator production PP&E      
COVID-19 [Line Items]      
Useful life measured as period of time, property, plant and equipment 10 years