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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
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value $ 190 [1] $ 223 [1]
Default fund investments 1,910 [2] 175 [2]
Total 2,100 398
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value 190 [1] 223 [1]
Default fund investments 681 [2] 175 [2]
Total 871 398
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Default fund investments 1,229 [2]  
Total $ 1,229  
[1] Primarily comprised of trading securities, mainly Swedish government debt securities, of $145 million as of September 30, 2013 and $201 million as of December 31, 2012. Of these securities, $102 million as of September 30, 2013 and $134 million as of December 31, 2012 are assets utilized to meet regulatory capital requirements primarily for clearing operations at NASDAQ OMX Nordic Clearing. This balance also includes our available-for-sale investment security in DFM valued at $45 million as of September 30, 2013 and $22 million as of December 31, 2012. See Note 6, “Investments,” for further discussion of our trading investment securities and available-for-sale investment security.
[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 $1,934 million recorded in the Condensed Consolidated Balance Sheets as of September 30, 2013, $1,229 million of cash contributions have been invested in reverse repurchase agreements and $681 million of cash contributions have been invested in highly rated government debt securities and term deposits. The remainder of this balance is held in cash. As of December 31, 2012, $175 million of cash contributions were invested in highly rated government debt securities. See Note 14, “Clearing Operations,” for further discussion of default fund contributions and margin deposits.