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Nasdaq Stockholders' Equity (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jul. 24, 2018
USD ($)
$ / shares
Mar. 26, 2018
USD ($)
$ / shares
Jan. 30, 2018
USD ($)
$ / shares
Jan. 31, 2019
USD ($)
$ / shares
Mar. 31, 2018
$ / shares
Dec. 31, 2018
USD ($)
vote
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Jan. 31, 2018
USD ($)
Stockholders Equity [Line Items]                  
Common stock, shares authorized (in shares)           300,000,000 300,000,000    
Common stock, shares issued (in shares)           170,709,425 172,373,432    
Common stock, shares outstanding (in shares)           165,165,104 167,441,030    
Common stock (in votes per share) | 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)           5,544,321 4,932,402    
Share repurchase program additional amount authorized | $                 $ 500,000,000
Share repurchase program, authorized amount | $                 $ 726,000,000
Remaining authorized share repurchase amounts under repurchase program | $           $ 332,000,000      
Number of shares of common stock repurchased (in shares)           4,508,426 2,843,519    
Preferred stock, shares authorized (in shares)           30,000,000      
Preferred stock par value (in dollars per share) | $ / shares           $ 0.01      
Payments of dividends | $           $ 280,000,000      
Cash dividends declared per common share (in dollars per share) | $ / shares $ 0.44 $ 0.44 $ 0.38   $ 0.44 $ 1.7 $ 1.46 $ 1.21  
Percent increase over prior quarter dividend           16.00%      
Dividends declared | $ $ 72,000,000 $ 73,000,000 $ 63,000,000     $ 280,000,000 $ 243,000,000 $ 200,000,000  
Other Repurchases of Common Stock                  
Stockholders Equity [Line Items]                  
Number of shares of common stock repurchased (in shares)           611,919      
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       $ 0.44          
Dividends declared | $       $ 73,000,000