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Nasdaq Omx Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2012
Dec. 31, 2013
Mar. 31, 2014
Series A Preferred Stock [Member]
Dec. 31, 2013
Series A Preferred Stock [Member]
Mar. 31, 2014
Other Repurchases of Common Stock [Member]
Jun. 30, 2014
Dividend Declared [Member]
Apr. 30, 2014
Dividend Declared [Member]
Stockholders Equity [Line Items]                  
Common stock, shares authorized 300,000,000     300,000,000          
Common stock, shares issued 216,181,636     214,419,155          
Common stock, shares outstanding 170,568,534     169,357,084          
Common stock holder voting rights, maximum percentage of the then-outstanding shares of NASDAQ OMX common stock 5.00%                
Common stock in treasury, shares 45,613,102     45,062,071          
Share repurchase program, authorized amount     $ 300            
Treasury shares acquired   321,000         551,919    
Average price of repurchased stock   $ 31.12              
Aggregate purchase price   10              
Remaining authorized share repurchase amounts under repurchase program 215                
Cash paid for repurchase of common stock   $ 10              
Preferred stock, shares authorized 30,000,000     30,000,000          
Preferred stock par value $ 0.01                
Preferred stock, series A convertible preferred stock: shares issued 0     1,600,000 0 1,600,000      
Preferred stock, series A convertible preferred stock: shares outstanding 0     0 0 0      
Cash dividend per share $ 0.28 $ 0.13             $ 0.15
Dividend declared, date payable               Jun. 27, 2014  
Dividend declared, record date               Jun. 13, 2014