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Nasdaq Stockholders' Equity (Narrative) (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 24, 2018 USD ($) $ / shares | Mar. 26, 2018 USD ($) $ / shares | Jan. 30, 2018 USD ($) $ / shares | Oct. 31, 2018 USD ($) $ / shares | Mar. 31, 2018 $ / shares | Sep. 30, 2018 USD ($) vote $ / shares shares | Sep. 30, 2017 $ / shares | Sep. 30, 2018 USD ($) vote $ / shares shares | Sep. 30, 2017 $ / shares shares | Jan. 31, 2018 USD ($) | Dec. 31, 2017 shares
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) |  |  |  |  |  | 169,423,805 |  | 169,423,805 |  |  | 172,373,432
Common stock, shares outstanding (in shares) |  |  |  |  |  | 163,949,047 |  | 163,949,047 |  |  | 167,441,030
Common stock (in votes per share) | 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) |  |  |  |  |  | 5,474,758 |  | 5,474,758 |  |  | 4,932,402
Share repurchase program additional amount authorized | $ |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Share repurchase program, authorized amount | $ |  |  |  |  |  | $ 726,000,000 |  | $ 726,000,000 |  |  |
Remaining authorized share repurchase amounts under repurchase program | $ |  |  |  |  |  | $ 332,000,000 |  | $ 332,000,000 |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  |  |  |  |  | 4,508,426 | 2,455,171 |  |
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 |  |  |
Payments of dividends | $ |  |  |  |  |  |  |  | $ 208,000,000 |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares | $ 0.44 | $ 0.44 | $ 0.38 |  | $ 0.44 | $ 0.44 | $ 0.38 | $ 1.26 | $ 1.08 |  |
Dividends declared | $ | $ 72,000,000 | $ 73,000,000 | $ 63,000,000 |  |  |  |  | $ 208,000,000 |  |  |
Percent increase over prior quarter dividend |  |  |  |  |  |  |  | 16.00% |  |  |
Other Repurchases of Common Stock |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock repurchased (in shares) |  |  |  |  |  |  |  | 542,356 |  |  |
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
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  |  |  | $ 0.44 |  |  |  |  |  |  |
Dividends declared | $ |  |  |  | $ 72,000,000 |  |  |  |  |  |  |

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