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Related parties and variable interest entities - Narrative (Details)
1 Months Ended 12 Months Ended
May 31, 2025
Dec. 31, 2025
EUR (€)
element
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Nov. 30, 2025
EUR (€)
Jul. 31, 2025
EUR (€)
Jun. 30, 2025
EUR (€)
Sep. 30, 2024
EUR (€)
Sep. 30, 2021
EUR (€)
Related Party Transaction [Line Items]                  
Repayment grace period, loan to related parties   3 years              
Number of elements | element   2              
2021 loan agreement                  
Related Party Transaction [Line Items]                  
Loans receivable   € 839,100,000 € 912,400,000            
Related parties, undrawn amount cancelled               € 87,600,000  
2024 loan agreement                  
Related Party Transaction [Line Items]                  
Loans receivable   610,000,000.0              
Loans and leases receivable, related parties   527,100,000              
Unamortized discount, related parties   € 68,000,000.0              
Effective interest rate, related parties   3.10%              
2025 loan agreement                  
Related Party Transaction [Line Items]                  
Loans receivable           € 444,000,000      
Loans and leases receivable, related parties   € 333,200,000              
Unamortized discount, related parties   € 110,800,000              
Effective interest rate, related parties   3.30%              
2025 short term loan agreement June                  
Related Party Transaction [Line Items]                  
Loans receivable             € 169,000,000    
2025 short term loan agreement Nov                  
Related Party Transaction [Line Items]                  
Loans receivable         € 212,500,000        
Loans and leases receivable, related parties   € 208,100,000              
Unamortized discount, related parties   € 4,800,000              
Effective interest rate, related parties   2.80%              
Zeiss High-NA funding commitment | Research and development support provided                  
Related Party Transaction [Line Items]                  
Commitment consideration paid   € 22,500,000 € 45,100,000 € 67,600,000          
Carl Zeiss SMT GmbH                  
Related Party Transaction [Line Items]                  
Term of loan to related parties   10 years              
Prepaid Expense   € 330,900,000              
Carl Zeiss SMT GmbH | 2025 restatement of the 2021 framework agreement                  
Related Party Transaction [Line Items]                  
Repayment grace period, loan to related parties 3 years                
Carl Zeiss SMT GmbH | Short term loans for supply chain obligations                  
Related Party Transaction [Line Items]                  
Term of loan to related parties 1 year                
Any Director or Officer of ASML or any associate thereof                  
Related Party Transaction [Line Items]                  
Transactions outside the normal course of business   0              
Long-term debt, average amount outstanding   0              
Long-term debt   € 0              
Minimum | Carl Zeiss SMT GmbH                  
Related Party Transaction [Line Items]                  
Interest rate on principal amount (in percentage)   0.01%              
Minimum | Carl Zeiss SMT GmbH | 2025 restatement of the 2021 framework agreement                  
Related Party Transaction [Line Items]                  
Term of loan to related parties 7 years                
Maximum | 2021 loan agreement                  
Related Party Transaction [Line Items]                  
Loans receivable                 € 1,000,000,000
Maximum | 2024 loan agreement                  
Related Party Transaction [Line Items]                  
Loans receivable               € 1,000,000,000  
Maximum | Carl Zeiss SMT GmbH                  
Related Party Transaction [Line Items]                  
Interest rate on principal amount (in percentage)   1.00%              
Maximum | Carl Zeiss SMT GmbH | 2025 restatement of the 2021 framework agreement                  
Related Party Transaction [Line Items]                  
Term of loan to related parties 15 years                
Carl Zeiss SMT GmbH | Carl Zeiss SMT Holding GmbH & Co. KG                  
Related Party Transaction [Line Items]                  
Ownership interest (in percentage)   100.00%              
Carl Zeiss SMT Holding GmbH & Co. KG | Carl Zeiss SMT Holding GmbH & Co. KG                  
Related Party Transaction [Line Items]                  
Ownership percentage (in percentage)   24.90%