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Research and development costs (Details) (EUR €) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Research and development costs (Textual) [Abstract] |  |  |
Research and Development credits as included in Research and Development costs | € 17.9 | € 25.1 | € 29.5

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- Definition Research and Development costs credits received. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | asml_
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Period Type: | duration