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Purchases of Equity Securities by the Issuer and Affiliated Purchasers (Details) (EUR €) | 0 Months Ended | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Dec. 31, 2012 | Dec. 14, 2012 | Nov. 30, 2012 | Oct. 31, 2012 | Sep. 30, 2012 | Aug. 31, 2012 | Jul. 29, 2012 | Jun. 30, 2012 | May 31, 2012 | Apr. 30, 2012 | Mar. 31, 2012 | Feb. 28, 2012 | Jan. 19, 2011 | Nov. 22, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 25, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased | 2,132,366 |  | 1,542,149 |  | 3,240,099 |  | 1,153,112 |  |  |  |  |  | 428,000 |  | 1,133,550 |  | 1,219,480 |  | 654,169 |  | 949,726 |  | 1,025,407 |  |  |  | 13,478,058 |  |  |  |
Summary of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price paid per share (EUR) | € 32.65 |  | € 48.24 |  | € 44.10 |  | € 41.86 |  |  |  |  |  | € 40.65 |  | € 38.61 |  | € 36.88 |  | € 37.18 |  | € 35.76 |  | € 34.71 |  |  |  | € 39.71 |  |  |  |
Total number of shares purchased as a part of publicly announced plans or programs | 2,132,366 |  | 13,478,058 | 2,200,000 | 11,935,909 |  | 8,695,810 |  | 7,542,698 |  | 7,542,698 |  | 7,542,698 |  | 7,114,698 |  | 5,981,148 |  | 4,761,668 |  | 4,107,499 |  | 3,157,773 |  |  | 11,278,058 |  |  |  |  |
Maximum value of shares that may yet be purchased under the plans or program | € 360,369,363 | [1] |  |  |  |  | € 112,099,413 | [1] | € 160,366,940 | [1] | € 160,366,940 | [1] | € 160,366,940 | [1] | € 177,764,616 | [1] | € 221,530,029 | [1] | € 266,501,698 | [1] | € 290,820,741 | [1] | € 324,780,615 | [1] |  |  |  |  |  |  |
Maximum number of shares that may yet be purchased under program | 2,200,000 | [2] |  |  | 1,542,149 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] | 2,200,000 | [2] |  |  |  |  |  |  |
Purchases of Equity Securities by the Issuer and Affiliated Purchasers (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase program agreement, maximum percentage authorized to buy back |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Up to a maximum of two times 10.0 percent of our issued share capital as of the date of authorization
Maximum amount of shares intended to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |
Value of shares repurchased during the period |  |  |  | 105,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 430,000,000 |  |  |  |  |
Average price paid per share |  |  |  | € 47.81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 38.13 | € 39.91 |  |  |  |
Conversion of stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77 |  |  |  |
Conversion of stock, Shares Converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Capital repayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,728,324,000) | [3],[4] |  |  |
Maximum amount of shares intended to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,130,000,000 |  |  |  |
Amount of decrease in nominal value per ordinary share upon third amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 9.18 |  |  |  |
Synthetic Share Buyback [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,411,216 |  |  |  |
[1] | Program to purchase shares up to a maximum amount of EUR 1,130 million. We have or will cancel these shares.
[2] | Program to purchase up to 2.2 million shares for the purpose of covering outstanding employee stock and stock option plans
[3] | In 2012, as part of the capital repayment, EUR 3,728.3 million of shareholders' equity was returned to our shareholders (excluding Intel Corporation ("Intel"), Taiwan Semiconductor Manufacturing Company Ltd. ("TSMC") and Samsung Electronics Corporation ("Samsung") (collectively referred to as "participating customers" in the Customer Co-investment Program)) and the number of shares was reduced by 23 Percent. See Note 26.
[4] | The difference of EUR 125.6 million between the capital repayment EUR 3,728.3 million and the net proceeds from issuance of shares EUR 3,853.9 million relates to the capital repayment on ASML's treasury shares which was also part of the Synthetic Share Buyback in November 2012.

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