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Nasdaq Stockholders' Equity (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2015
Jan. 31, 2014
Sep. 30, 2012
Stockholders Equity [Line Items]              
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized        
Common stock, shares issued 170,325,304us-gaap_CommonStockSharesIssued 170,325,304us-gaap_CommonStockSharesIssued 214,419,155us-gaap_CommonStockSharesIssued        
Common stock, shares outstanding 168,795,263us-gaap_CommonStockSharesOutstanding 168,795,263us-gaap_CommonStockSharesOutstanding 169,357,084us-gaap_CommonStockSharesOutstanding        
Common stock holder voting rights, maximum percentage of the then-outstanding shares of NASDAQ OMX common stock 5.00%ndaq_CommonStockHolderVotingRights 5.00%ndaq_CommonStockHolderVotingRights          
Common stock in treasury, shares 1,530,041us-gaap_TreasuryStockShares 1,530,041us-gaap_TreasuryStockShares 45,062,071us-gaap_TreasuryStockShares        
Treasury shares retired 48,736,910us-gaap_TreasuryStockSharesRetired            
Share repurchase program, authorized amount $ 500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 $ 500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1         $ 300,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Remaining authorized share repurchase amounts under repurchase program 537,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 537,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1          
Treasury shares acquired   4,592,194us-gaap_TreasuryStockSharesAcquired 321,000us-gaap_TreasuryStockSharesAcquired        
Average price of repurchased stock   $ 38.85us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 31.12us-gaap_TreasuryStockAcquiredAverageCostPerShare        
Aggregate purchase price   $ 178,000,000us-gaap_TreasuryStockValueAcquiredParValueMethod $ 10,000,000us-gaap_TreasuryStockValueAcquiredParValueMethod $ 275,000,000us-gaap_TreasuryStockValueAcquiredParValueMethod      
Preferred stock, shares authorized 30,000,000us-gaap_PreferredStockSharesAuthorized 30,000,000us-gaap_PreferredStockSharesAuthorized 30,000,000us-gaap_PreferredStockSharesAuthorized 30,000,000us-gaap_PreferredStockSharesAuthorized      
Preferred stock par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare          
Preferred stock, series A convertible preferred stock: shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued 1,600,000us-gaap_PreferredStockSharesIssued 1,600,000us-gaap_PreferredStockSharesIssued      
Preferred stock, series A convertible preferred stock: shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding      
Cash dividend per share   $ 0.58us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.39us-gaap_CommonStockDividendsPerShareDeclared      
Other Repurchases of Common Stock [Member]              
Stockholders Equity [Line Items]              
Treasury shares acquired   770,999us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= ndaq_OtherRepurchasesOfCommonStockMember		          
Subsequent Event [Member]              
Stockholders Equity [Line Items]              
Cash dividend per share         $ 0.15us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Dividend declared, date payable           Mar. 27, 2015  
Dividend declared, record date           Mar. 13, 2015