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Nasdaq Stockholders' Equity (Narrative) (Details) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) vote $ / shares shares | Jan. 30, 2017 $ / shares | Apr. 30, 2017 $ / shares | Mar. 31, 2017 USD ($) vote $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 shares | Dec. 31, 2014 USD ($)
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 300,000,000 |  |  | 300,000,000 |  | 300,000,000 |
Common stock, shares issued (in shares) | 169,760,142 |  |  | 169,760,142 |  | 170,501,186 |
Common stock, shares outstanding (in shares) | 165,168,584 |  |  | 165,168,584 |  | 166,579,468 |
Votes per share of common stock | vote | 1 |  |  | 1 |  |  |
Common stock holder voting rights, maximum percentage of the then-outstanding shares of Nasdaq common stock | 5.00% |  |  | 5.00% |  |  |
Common stock in treasury (in shares) | 4,591,558 |  |  | 4,591,558 |  | 3,921,718 |
Share repurchase program, authorized amount | $ |  |  |  |  | $ 370,000,000 |  | $ 500,000,000
Remaining authorized share repurchase amounts under repurchase program | $ | $ 273,000,000 |  |  | $ 273,000,000 |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  | 2,215,755 | 490,032 |  |
Preferred stock, shares authorized (in shares) | 30,000,000 |  |  | 30,000,000 |  |  |
Preferred stock par value (in dollars per share) | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |
Amount paid | $ |  |  |  | $ 53,000,000 |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  |  |  | $ 0.32 | $ 0.57 |  |
April 2017 | Subsequent Event |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  |  | $ 0.38 |  |  |  |
Percent increase over prior quarter dividend |  |  | 19.00% |  |  |  |
January 30, 2017 |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Amount paid | $ | $ 53,000,000 |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 0.32 |  |  |  |  |
Other Repurchases of Common Stock |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  | 668,038 |  |  |
Series A Preferred Stock |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Preferred stock, series A convertible preferred stock, shares issued (in shares) | 0 |  |  | 0 |  | 0 |
Preferred stock, series A convertible preferred stock, shares outstanding (in shares) | 0 |  |  | 0 |  | 0 |

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