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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, 2013
Sep. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Mar. 31, 2013
Other Repurchases of Common Stock [Member]
Apr. 30, 2013
Dividend Declared [Member]
Stockholders Equity [Line Items]                
Common stock, shares authorized 300,000,000     300,000,000        
Common stock, shares issued 213,426,908     213,426,908        
Common stock, shares outstanding 165,761,597     165,605,838        
Common stock holder voting rights, maximum percentage of the then-outstanding shares of NASDAQ OMX common stock 5.00%              
Common stock in treasury, shares 47,665,311     47,821,070        
Share repurchase program, authorized amount   $ 300            
Treasury shares acquired 321,000           80,912  
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   $ 50          
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 1,600,000     1,600,000 1,600,000 1,600,000    
Preferred stock, series A convertible preferred stock: shares outstanding 0     0 0 0    
Cash dividend per share $ 0.13             $ 0.13
Dividend declared, date payable               Jun. 28, 2013
Dividend declared, record date               Jun. 14, 2013