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Legal contingencies (Details) (EUR €) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Legal contingencies (Textual) [Abstract] |  |  |
Litigation charges | € 0 | € 0 | € 1.5

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- Details
Name: | asml_LegalContingenciesTextualAbstract
Namespace Prefix: | asml_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Legal charges related to litigation when the related legal services are actually provided. + References No definition available. + Details
Name: | asml_LitigationCharges
Namespace Prefix: | asml_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant