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Nasdaq Stockholders' Equity (Schedule of Dividends Declared) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Jan. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Dividends Payable [Line Items] |  |  |  |
Dividend per common share (in dollars per share) |  |  | $ 0.32 | $ 0.57
Total Amount Paid |  |  | $ 53 |
January 30, 2017 |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividend per common share (in dollars per share) |  | $ 0.32 |  |
Total Amount Paid | $ 53 |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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