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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.

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- Definition In anticipation of new regulations proposed by the European Market Infrastructure Regulation, NASDAQ OMX Nordic Clearing implemented three member sponsored default funds in March 2012: one related to financial markets, one related to commodities markets, and a mutualized fund. Under this new regulatory structure, NASDAQ OMX Nordic Clearing and its clearing members must contribute to the total regulatory capital related to the clearing operations of NASDAQ OMX Nordic Clearing. This new requirement ensures the alignment of risk between NASDAQ OMX Nordic Clearing and its clearing members. Contributions made to the default funds will be proportional to the exposures of each clearing member. This structure applies an initial separation of default fund contributions for the financial and commodities markets in order to create a buffer for each market's counterparty risks. Simultaneously, a mutualized default fund provides capital efficiencies with regard to total regulatory capital required. When a clearing member is active in both the financial and commodities markets, contributions must be made to both markets' default funds.Clearing members' eligible contributions may include cash and non-cash contributions. Cash contributions received are invested by NASDAQ OMX Nordic Clearing, in accordance with our investment policy, either in highly rated government debt securities or reverse repurchase agreements with highly rated government debt securities as collateral. Clearing members' cash contributions are included in default funds and margin deposits in the Condensed Consolidated Balance Sheets as both a current asset and a current liability. + References No definition available. + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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