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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