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Nasdaq Stockholders' Equity (Narrative) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 $ / shares | Dec. 31, 2016 USD ($) vote $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares | Mar. 31, 2016 USD ($)
Stockholders Equity [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  | 300,000,000 | 300,000,000 |  |
Common stock, shares issued (in shares) |  | 170,501,186 | 167,241,734 |  |
Common stock, shares outstanding (in shares) |  | 166,579,468 | 164,324,270 |  |
Votes per share of common stock | vote |  | 1 |  |  |
Common stock holder voting rights, maximum percentage of the then-outstanding shares of Nasdaq common stock |  | 5.00% |  |  |
Common stock in treasury (in shares) |  | 3,921,718 | 2,917,464 |  |
Share repurchase program, authorized amount | $ |  |  | $ 500,000,000 |  | $ 370,000,000
Remaining authorized share repurchase amounts under repurchase program | $ |  | $ 429,000,000 |  |  |
Number of shares of common stock repurchased (in shares) |  | 1,547,778 | 7,191,685 |  |
Preferred stock, shares authorized (in shares) |  | 30,000,000 |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |
Amount paid | $ |  | $ 200,000,000 | $ 149,000,000 | $ 98,000,000 |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 1.21 | $ 0.90 | $ 0.58 |
Other Repurchases of Common Stock |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Number of shares of common stock repurchased (in shares) |  | 1,004,254 |  |  |
Series A Preferred Stock |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Preferred stock, series A convertible preferred stock: shares issued (in shares) |  | 0 | 0 |  |
Preferred stock, series A convertible preferred stock: shares outstanding (in shares) |  | 0 | 0 |  |
Subsequent Event |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares | $ 0.32 |  |  |  |

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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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