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Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value $ 197 [1] $ 189 [1]
Default fund investments 2,211 [2] 1,867 [2]
Total 2,408 2,056
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value 192 [1] 189 [1]
Default fund investments 710 [2] 774 [2]
Total 902 963
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value 5 [1]  
Default fund investments 1,501 [2] 1,093 [2]
Total $ 1,506 $ 1,093
[1] As of March 31, 2014 and December 31, 2013, Level 1 financial investments, at fair value were primarily comprised of trading securities, mainly Swedish government debt securities. Of these securities, $177 million as of March 31, 2014 and $167 million as of December 31, 2013 are assets utilized to meet regulatory capital requirements primarily for clearing operations at NASDAQ OMX Nordic Clearing.
[2] 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.