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General information / Summary of significant accounting policies (Details) (EUR €)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
System
Dec. 31, 2011
System
Dec. 31, 2010
System
General information / Summary of significant accounting policies [Abstract]      
Voting Rights Required for consolidation of subsidiaries more than half    
Cash and cash equivalents maturity period Three months or less    
Date of annual goodwill impairment test 30 September    
Amount of repurchase commitments € 0 € 0  
Standard product warranty period in months 12 months    
Product warranty on certain optic parts period in months 60 months    
NXE systems recognized 1 3 0
Short-term investments maturity period longer than three months and less than one year    
Net income per ordinary share      
Net income 1,146,316,000 1,466,960,000 [1] 1,021,820,000
Weighted average number of shares outstanding during the year (after deduction of treasury stock) 424,096 425,618 [1] 435,146
Basic net income per ordinary share € 2.70 € 3.45 [1] € 2.35
Plus shares applicable to:      
Options and conditional shares 2,890 [2] 3,435 [2] 3,828 [2]
Dilutive potential ordinary shares 2,890 3,435 3,828
Adjusted weighted average number of shares 426,986 [2] 429,053 [1],[2] 438,974 [2]
Diluted net income per ordinary share € 2.68 [2] € 3.42 [1],[2] € 2.33 [2]
Revenue Recognition (Textual) [Abstract]      
Deferred Revenue 739,136,000 816,045,000  
Lease term 75.00%    
Present value of minimum lease payments 90.00%    
Shipments of new technology [Member]
      
Revenue Recognition (Textual) [Abstract]      
Deferred Revenue 0 48,600,000 38,500,000
Revenue recognition from new technology 43,700,000 119,300,000 0
Extended and enhanced (optic) warranty contracts [Member]
      
Revenue Recognition (Textual) [Abstract]      
Deferred Revenue € 242,200,000 € 280,100,000  
Maximum [Member] | Buildings and constructions [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 40 years    
Maximum [Member] | Machinery and equipment [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 5 years    
Maximum [Member] | Leasehold improvements [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 10 years    
Maximum [Member] | Furniture, fixtures and other equipment [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 5 years    
Maximum [Member] | Internally developed software [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 5 years    
Minimum [Member] | Buildings and constructions [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 5 years    
Minimum [Member] | Machinery and equipment [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 2 years    
Minimum [Member] | Leasehold improvements [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 5 years    
Minimum [Member] | Furniture, fixtures and other equipment [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 3 years    
Minimum [Member] | Internally developed software [Member]
      
Property plant and equipment estimated useful life      
Estimated useful life (in years) 3 years    
Intellectual property [Member] | Maximum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 10 years    
Intellectual property [Member] | Minimum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 3 years    
Developed technology [Member] | Maximum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 6 years    
Customer relationships [Member] | Maximum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 8 years    
Other [Member] | Maximum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 6 years    
Other [Member] | Minimum [Member]
      
Finite lived intangible assets estimated useful life      
Estimated useful life (in years) 2 years    
[1] As of January 1, 2011, we adopted Accounting Standards Update ("ASU") 2009-13, "Revenue Arrangements with Multiple Deliverables" which amended ASC 605-25. The ASU was adopted prospectively and had an insignificant impact on timing and allocation of revenues. See Note 1 to the consolidated financial statements.
[2] The calculation of diluted net income per ordinary share assumes the exercise of options issued under ASML stock option plans and the issuance of shares under ASML share plans for periods in which exercises or issuances would have a dilutive effect. The calculation of diluted net income per ordinary share does not assume exercise of such options or issuance of shares when such exercises or issuance would be anti-dilutive.