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Nasdaq Stockholders' Equity (Common Stock in Treasury) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Equity [Abstract] |  |
Number of shares of common stock repurchased (in shares) | 2,215,755 | 490,032
Average per share price of repurchased stock (in dollars per share) | $ 70.64 | $ 59.37
Total purchase price (in millions) | $ 156 | $ 29

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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