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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