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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.

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