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Revenue from contracts with customers - Narrative (Details) - EUR (€)
€ in Billions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Standard warranty coverage on systems 12 months  
Net contract liability € 18.9 € 17.9
Purchase agreement term (up to) 5 years  
Amount of remaining performance obligations € 46.5 € 43.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Percentage expected to be recognized   59.00%
Period revenue is expected to be recognized   12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Percentage expected to be recognized 65.00%  
Period revenue is expected to be recognized 12 months