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	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial investments, at fair value	$ 162	[1]	$ 223	[1]
Default fund investments	1,867	[2]	175	[2]
Default funds and margin deposits	1,961		209
Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial investments, at fair value	162		201
Restricted assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial investments, at fair value	140		134
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial investments, at fair value	22
Reverse Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Default funds and margin deposits	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	$ 774		$ 175

[1] As of December 31, 2013, balance is comprised of trading securities, mainly Swedish government debt securities, of $162 million. As of December 31, 2012, balance is primarily comprised of trading securities, mainly Swedish government debt securities, of $201 million. Of these securities, $140 million as of December 31, 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. As of December 31, 2012, this balance also included our available-for-sale investment security in DFM which had a fair value of $22 million. In the fourth quarter of 2013 we sold this investment security. 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 $1,961 million recorded in the Consolidated Balance Sheets as of December 31, 2013, $1,093 million of cash contributions have been invested in reverse repurchase agreements and $774 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 16, “Clearing Operations,” for further discussion of default fund contributions and margin deposits.