v2.4.0.8
Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Additional Information) (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 funds and margin deposits 2,253 1,961
Restricted assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial investments, at fair value 177 167
Reverse Repurchase Agreements [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Default funds and margin deposits 1,501 1,093
US Government Debt Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Default funds and margin deposits $ 710 $ 774
[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.