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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Clearing Operations [Line Items]    
Investment of cash contributions in highly rated debt securities $ 2,211 [1] $ 1,867 [1]
NASDAQ OMX Nordic [Member]
    
Clearing Operations [Line Items]    
Default fund cash contributions invested in repurchase agreements 1,501  
Default fund cash contributions invested in highly rated governmant debt securities $ 710  
[1] Default fund and margin deposit investments include cash contributions invested by NASDAQ OMX Nordic Clearing, in accordance with its investment policy, either in highly rated government debt securities or reverse repurchase agreements with highly rated government debt securities as collateral. Of the total balance of $2,253 million recorded in the Condensed Consolidated Balance Sheets as of March 31, 2014, $1,501 million of cash contributions have been invested in reverse repurchase agreements and $710 million of cash contributions have been invested in highly rated government debt securities. The remainder of this balance is held in cash and term deposits. Of the total balance of $1,961 million recorded in the Condensed Consolidated Balance Sheets as of December 31, 2013, $1,093 million of cash contributions were invested in reverse repurchase agreements and $774 million of cash contributions were invested in highly rated government debt securities.